防毒面具滤料要求其滤毒性能好,不同毒物宜选用的适宜滤料——硫酸酮适用于 A.氨 B.

题型:单项选择题

问题:

防毒面具滤料要求其滤毒性能好,不同毒物宜选用的适宜滤料——硫酸酮适用于

A.氨
B.苯
C.一氧化碳
D.氰化物
E.汞

考点:口腔执业助理医师公卫基础知识公共卫生主治医师基础知识
题型:单项选择题

Can dolphins talk ? Maybe they can’t talk with words ,but they can talk with sounds . They show their feelings with sounds .

Dolphins travel in group . We call a group of them a “school “. They don’t study , but they travel together.

Dolphins talk to other dolphins in the school .They give information . They tell other dolphins when they are happy or sad or afraid . They say “welcome “when a dolphin comes back to the school . They talk when they play .

They make a few sounds above water . They make many more sounds under water . People can hear these sounds because they are very high .

Sometimes people catch dolphins for large aquariums . People can watch the dolphins in a show . Dolphins don’t like to be in the aquarium , being away from their school . They are sad and lonely if they do so .

There are many stories about dolphins . They help people . Sometimes they save someone’s life . Many people believe that dolphins can bring good luck .

小题1:Dolphins show their feelings with ________.

A.pictures

B.words

C.waves

D.sounds小题2:Dolphins __________ in the school according to the passage.

A. give information

B.don’t tell other dolphins when they are afraid

C. talk when they sleep

D.say “ sorry” when a dolphin comes back小题3:People can’t hear the dolphin’s sounds because ______________>

A.they are above the water

B.they are under the water

C.they are very high

D.they are very low小题4:Many people believe that dolphins can bring_______________.

A.good luck

B.health

C.wealth

D.danger小题5:Which of the following is TRUE ?

A. Dolphins study in the school.

B.Dolphins travel in a group.

C.Dolphins like to be away from their school.

D.Dolphins sometimes kill people.

题型:单项选择题
求如图所示的交变电流的有效值,其中每个周期的后半周期的图象为半个周期的正弦曲线(   )

A.5A

B.5A

C.5/2A

D./2A

题型:单项选择题

关于电解质在细胞内液和细胞外液中的分布,下列说法正确的是()

A.细胞内液的阳离子以钾为主

B.细胞外液的阳离子以镁为主

C.细胞内液的阴离子有蛋白质、HPO42-

D.细胞外液的阴离子有Cl-和HCO3-

E.成人的总水量2/3在细胞外,1/3在细胞内

题型:单项选择题

战略计划与长期计划区别?

题型:单项选择题

万里长江第一桥是哪里?

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