单项选择题
A.Frequency meter B.Ohmmeter C.Induction voltage regulator D.Current transformer governor
The part of the shipboard electrical system used to con...
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
A semiconductor is a material with a （）.A.conductivity ...
单项选择题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 D.low conductivity at high temperatures
The sub-multiple prefix “micro” means （）.A.thousandth (...
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) D.trillionth (10 to the-12th power)
