单项选择题
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.conductivity higher than a normal conductor
B.conductivity higher than a normal insulator
C.high conductivity at low temperatures
D.low conductivity at high temperatures -
单项选择题
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)
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单项选择题
A signal derived from a controlled function and returned to the initiating point is called a/an （）.
A.monitoring signal
B.inverse signal
C.reverse signal
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