單項(xiàng)選擇題The switchboards for a-csystems differ from the d-cswitch gear in that the open type panels are generally() and the dead-front switch gear is the common rule.

A.permissibly
B.permissible
C.no permissible
D.not permissible


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2.單項(xiàng)選擇題The current flowing first in one direction and then in another is called() current.

A.an alternating
B.a rush
C.a direct
D.an exciting

3.單項(xiàng)選擇題Shore power must be() during dock repair.

A.disconnected
B.switched off
C.cut off
D.connected

4.單項(xiàng)選擇題The coil of wire rotating in the magnetic field produces the().

A.voltage
B.current
C.power
D.frequency

5.單項(xiàng)選擇題() is used to produce electric power.

A.An alternator
B.fresh water generator
C.A compressor
D.A clarifier

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