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【单选题】深圳市气象台发布风暴潮、海啸预警信息生效期间，行调接报发现海水倒灌入车站并造成站厅积水超（ ） 时，通知车站视情况远程关闭站厅层环控电控室（或低压配电室）。
A.
10m
B.
20cm
C.
15cm
D.
1m
【单选题】计算机的主频是指 ( )
A.
微处理器主时钟在1min内发出的时钟脉冲数
B.
微处理器主时钟在1s内发出的时钟脉冲数
C.
微处理器主时钟在10min内发出的时钟脉冲数
D.
微处理器主时钟在10s内发出的时钟脉冲数
【单选题】请根据短文的内容，回答题。 Hurricane (1) A hurricane (飓风) is a tropical storm with winds that have reached a constant speed of 74 miles per hour. Hurricane winds blow in a large spiral (螺旋) around a relative calm ...
A.
Where do hurricanes usually happen?
B.
What damages can a hurricane cause?
C.
What should you do during a hurricane?
D.
What is a hurricane?
E.
What are different names of hurricanes?
F.
How do you know a hurricane is coming?