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问题 单项选择题

水轮发电机停机过程中，当机组转数下降到（）额定转数时，电气制动装置投入。

A、20%～30%；

B、50%～70%；

C、85%；

D、40%～50%。

答案

参考答案：B

多项选择题

《国家气象灾害应急预案》中指出，气象灾害预警信息内容包括（）等。

A.气象灾害的类别

B.预警级别

C.起始时间

D.可能影响范围

E.警示事项

F.应采取的措施和发布机关
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单项选择题

Audrey is a Chinese-American student. She has found many value(价值观) differences between Chinese and Americans.
About money
1) Americans would like to spend more than they have, so many of them are always in debt (欠债). Chinese usually spend less than they have, so many of them always have money left in the bank.
2) American kids love to make money by themselves. Chinese kids always ask their parents for money.
3) American parents think it is not useful to send their children to an expensive university. Chinese parents would do anything to send their children to good universities and that might make them very poor sometimes.
About school
1) Many American girls take part in sports, dancing and singing groups while Chinese girls take part in academic groups.
2) Some American students think that "B" is a gift while Chinese students think that "B" is terrible.
American parents and Chinese parents
American parents allow their daughters or sons to go out to have some part-time jobs in their free time or at the weekends. Chinese parents usually don’t allow their children to do so in middle or high schools.

What would a Chinese middle school student probably NOT do at the weekends according to the passage

A．Study at home

B．Do part-time jobs

C．Take part in sports groups

D．Do chores
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