7,358 免费图片适用于危险

警告性质动物黄色黑色背景生物学意识细菌细节

Radiation warning

Fly Amanita Mushroom

医疗药物餐饮

Toadstool Mushroom

医疗药物性质

Crocodile

Warning Reindeer Roadsign

Bear

Closed

Invisible Girl

孩子们森林

Sign (Glass hazard)

Brown Leopard on Chain Link Fence

野生动物动物

Magical Mushrooms

医疗药物性质

Woman playing hide and seek

Sign (Explosion risk)

Female dinosaur laying her eggs

A medical illustration of Clostridioides difficile bacteria, formerly known as Clostridium difficile. Original image sourced from US Government department: Public Health Image Library, Centers for Disease Control and Prevention. Under US law this image is copyright free, please credit the government department whenever you can”.

Tank

Beautiful Magic Mushrooms

医疗药物性质

Brown Tiger

野生动物动物

Dark clouds

Electric tower

大黄蜂昆虫

Magic Mushroom

医疗药物性质

Poisonous Mushroom

医疗药物餐饮

Closeup Photo of Tiger

Danger Mark

眼镜王蛇

爬行动物动物

Dangerous track

Bear

Group of People Sitting Beside the Bonfire during Night Time

Human skull

骨骼系統颅骨

A medical illustration of Clostridioides difficile bacteria, formerly known as Clostridium difficile. Original image sourced from US Government department: Public Health Image Library, Centers for Disease Control and Prevention. Under US law this image is copyright free, please credit the government department whenever you can”.

Dangerous road for cyclists

孩子们旅行

Amanita Mushrooms in the Grass

Sign (Biohazard)

Tank

钩鼻海蛇

Electic Wires Pole

塔式建筑电

A female, Aedes aegypti mosquito obtaining a blood meal from a human host. Original image sourced from US Government department: Public Health Image Library, Centers for Disease Control and Prevention. Under US law this image is copyright free, please credit the government department whenever you can”.

Edible Yellow Coral Mushroom

医疗药物餐饮

Railway Contact Wires

Amanita Muscaria Mushroom

医疗药物性质

barbed wire

角高體金眼鯛

海洋动物海洋生物

A medical illustration of drug–resistant, nontyphoidal, Salmonella sp. bacteria. Original image sourced from US Government department: Public Health Image Library, Centers for Disease Control and Prevention. Under US law this image is copyright free, please credit the government department whenever you can”.

A 3D image of a group of anaerobic, spore-forming, Clostridium sp. organisms. Original image sourced from US Government department: Public Health Image Library, Centers for Disease Control and Prevention. Under US law this image is copyright free, please credit the government department whenever you can”.

电子学细菌

Sign (Slippery floor)

Sign (Hot surface)

Sign (Irritant)

A 3D illustration provides a graphical representation of a single norovirus virion, set against a white background. Original image sourced from US Government department: Public Health Image Library, Centers for Disease Control and Prevention. Under US law this image is copyright free, please credit the government department whenever you can”.

电子学细菌

A medical illustration of vancomycin–resistant, Enterococci sp. bacteria. Original image sourced from US Government department: Public Health Image Library, Centers for Disease Control and Prevention. Under US law this image is copyright free, please credit the government department whenever you can”.

电子学细菌

A close left lateral view of a female Oriental rat flea, Xenopsylla cheopis that transmit the bacterium Yersinia pestis, the causative agent of plague. Original image sourced from US Government department: Public Health Image Library, Centers for Disease Control and Prevention. Under US law this image is copyright free, please credit the government department whenever you can”.

Sign (Irritant)

Amanita Muscaria Mushroom

医疗药物餐饮

A medical illustration of drug–resistant, Mycoplasma genitalium bacteria. Original image sourced from US Government department: Public Health Image Library, Centers for Disease Control and Prevention. Under US law this image is copyright free, please credit the government department whenever you can”.

Danger Death

Painted Metal

Sign (Hazardous to the environment)

Sunflowers and Bee

barbed wire

Giant Lightning Storm

A 3D graphical representation of a number of norovirus virions, set against a black background. Original image sourced from US Government department: Public Health Image Library, Centers for Disease Control and Prevention. Under US law this image is copyright free, please credit the government department whenever you can”.

Sign (Danger overhead crane)

An adult bedbug, Cimex lectularius ingestinging a blood meal. Original image sourced from US Government department: Public Health Image Library, Centers for Disease Control and Prevention. Under US law this image is copyright free, please credit the government department whenever you can”.

Black Cat Green Eyes Looking Dangerous

Sign (High voltage)

Sign (Flammable materials)

Asteroid

外层空间小行星

Sign (Low temperature)

Woman Swimming

Sign (Laser Radiation)

食人鱼

A photomicrograph of a direct fluorescent antibody (DFA)–stained specimen, revealing the presence of numerous Francisella tularensis coccobacilli. Original image sourced from US Government department: Public Health Image Library, Centers for Disease Control and Prevention. Under US law this image is copyright free, please credit the government department whenever you can”.

电子学细菌

Traffic Signal Red

Sign (Radiation)

A 1000X photomicrograph magnification of numerous, rod-shaped, Gram–negative, Yersinia pestis bacilli. Original image sourced from US Government department: Public Health Image Library, Centers for Disease Control and Prevention. Under US law this image is copyright free, please credit the government department whenever you can”.

A photomicrograph reveals numerous Gram–negative, Francisella tularensis coccobacilli, the bacterium responsible for causing the disease, tularemia. Original image sourced from US Government department: Public Health Image Library, Centers for Disease Control and Prevention. Under US law this image is copyright free, please credit the government department whenever you can”.

电子学细菌

A female, Aedes aegypti mosquito obtaining a blood meal from a human host. Original image sourced from US Government department: Public Health Image Library, Centers for Disease Control and Prevention. Under US law this image is copyright free, please credit the government department whenever you can”.

A 125X photomicrograph magnification of a hematoxylin and eosin (H&E)–stained lung tissue specimen, revealed the presence of cytoarchitectural changes indicative of a blastomycosis fungal infection. Original image sourced from US Government department: Public Health Image Library, Centers for Disease Control and Prevention. Under US law this image is copyright free, please credit the government department whenever you can”.

A gator slinks through tall grass.

短吻鱷动物

Firefighters attack a fire

A female, Aedes aegypti mosquito obtaining a blood meal from a human host. Original image sourced from US Government department: Public Health Image Library, Centers for Disease Control and Prevention. Under US law this image is copyright free, please credit the government department whenever you can”.

Danger Sign

建筑物景观

A horde of unidentified bats, an animal know to be a possible carrier of the rabies virus. Original image sourced from US Government department: Public Health Image Library, Centers for Disease Control and Prevention. Under US law this image is copyright free, please credit the government department whenever you can”.

Sign (General warning)

High Voltage Sign

尼罗河鳄鱼

非洲动物短吻鱷

納氏臀點脂鯉

Two Dragons and Monsters attacking a boat

A medical illustration of drug–resistant, Streptococcus pneumoniae bacteria. Original image sourced from US Government department: Public Health Image Library, Centers for Disease Control and Prevention. Under US law this image is copyright free, please credit the government department whenever you can”.

电子学细菌

Novel Coronavirus SARS-CoV-2–This scanning electron microscope image shows SARS-CoV-2—also known as 2019-nCoV, the virus that causes COVID-19. Original image sourced from US Government department: The National Institute of Allergy and Infectious Diseases. Under US law this image is copyright free, please credit the government department whenever you can”.

Sign (Watch for falling objects)

Knives

Old Concrete On Ground Cracked

A medical illustration of vancomycin–resistant, Enterococci sp. bacteria. Original image sourced from US Government department: Public Health Image Library, Centers for Disease Control and Prevention. Under US law this image is copyright free, please credit the government department whenever you can”.

电子学细菌

Army men

An alligator suns itself on the bank of a pond.

短吻鱷动物

A literal pit of vipers at the "World's Largest Rattlesnake Roundup" in Sweetwater, Texas. Original image from Carol M. Highsmith’s America, Library of Congress collection.

Sign (General Warning)

Sign (Forklift trucks)

载货汽车背景

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