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【单选题】
Attention, attention. This is your captain speaking. We have a miner flooding in the engine room. There is no immediate danger to crew, passengers or vessel, and there is no reason to be alarmed. For safety reasons I request all crew members to go to their assembly stations. All officers to report to the bridge. Watch keepers remain at stations until further order. there is no danger at this time. Out. Q4:What are watchkeepers requested to do?A.
To go to assembly stations.
B.
To report to bridge.
C.
To remain at stations.
D.
To fight the flooding.
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举一反三
【单选题】永磁同步电机磁通总是沿磁阻( )的路径闭合,利用磁引力拉动转子旋转,于是永磁转子就会跟随定子产生的旋转磁场( )旋转.
A.
最小、同步
B.
最大、同步
C.
最大、异步
D.
最小、异步
【简答题】设函数 在点 处连续,且 , ,则