传染病流行需要同时具备三个环节：传染源、传播途径和易感人群．下列属于传染源的是_刷题宝

题干

传染病流行需要同时具备三个环节：传染源、传播途径和易感人群．下列属于传染源的是（　　）

A：患有狂犬病的狗

B：患过流行性感冒的健康儿童

C：痢疾病人排出的粪便

D：结膜炎患者用过的毛巾

上一题下一题 0.0难度选择题更新时间:2018-05-31 12:03:35

答案(点此获取答案解析）

A

同类题1

唐朝时，我国与各国间的友好往来出现了前所未有的盛况。其原因是（）

①中国对外交通比过去发达

②中国经济文化处于世界领先地位

③唐朝统治者推行开放的对外政策

④唐朝疆域比过去扩大

同类题2

同类题3

如图，在直三棱柱

A B C - A_{1} B_{1} C_{1}

A D ⊥

A_{1} B C

D

A_{1} B

同类题4

What do you think the future will be like? Here are some answers from some students.

Mary: Everyone will have a computer at home. There will also be many machines in the future. Then people will work only two or three days in a week.

Jack: The weather in the future will be very hot. People can't live on the earth. They will have to look for (寻找) another planet to live on.

Linda: I think the life in the future will be nice. There will be a lot of flowers and trees. And cities will look like parks.

Henry: Every family will have a family doctor, so people will be seldom ill (很少生病) They will live to 120 years old.

同类题5

用如图所示装置制备常见气体．请回答下列问题：

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