单项选择题
A switchboard for an AC electrical system requires the use of which of the following devices（）.
A.Frequency meter
B.Ohmmeter
C.Induction voltage regulator
D.Current transformer governor
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The part of the shipboard electrical system used to control the distribution of power to the branch circuits, is the （）.
A.bridge control panel
B.disconnect links
C.governor relay box
D.main switchboard -
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A semiconductor is a material with a （）.
A.conductivity higher than a normal conductor
B.conductivity higher than a normal insulator
C.high conductivity at low temperatures
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The sub-multiple prefix “micro” means （）.
A.thousandth (10 to the-3rd power)
B.millionth (10 to the-6th power)
C.billionth (10 to the-9th power)
D.trillionth (10 to the-12th power)
