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【单选题】
三相异步电动机旋转磁场的方向是由三相电源的( )决定。 A 、 B 、 相位 C 、频率 D 不清楚A.
B.
C.
D.
D
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举一反三
【单选题】When the machinery spaces are in the periodic unmanned condition, ____ shall be immediately available and on call to attend the machinery space
A.
the chief engineer
B.
the designated engineer from shipyard
C.
the designated duty officer in charge of the engineering watch
D.
the designated surveyor from classification society
【单选题】Were anything to happen, I ______ immediatel y.
A.
return
B.
returned
C.
didn ’ t return
D.
would return
【单选题】These natural disasters have warned us that everyone should start to protect the_________ immediately.
A.
amusement
B.
development
C.
environment
D.
government
【单选题】If a crew member is exposed to phenol by way of skin or eye contact, you should IMMEDIATELY ______.
A.
administer oxygen
B.
treat victim for shock
C.
flush skin and eyes with water
D.
give victim stimulant
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