單項(xiàng)選擇題

Which of the listed sections of an emergency switchboard is used to supply power for alarm signals under emergency conditions?（）

A.The generator and bus transfer section
B.The 450 volt, 60 cycle, 3 phase bus
C.The 120 volt, 3 phase, 60 cycle bus
D.The 24 volt DC bus

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單項(xiàng)選擇題

When the current in a power transmission line is increased, the power loss （）

A.increases as the square of the current
B.decreases as the square root of the current
C.remains the same, as it is independent of current flow
D.increases in direct proportion as the current

單項(xiàng)選擇題

An operational amplifier, as used in todays consoles, may have a calculated gain of 5√This means that as the input changes by （）

A.1 volt, the output changes 5 volts
B.5 volts, the output changes 1 volt
C.5 volts, the output changes 10 volts
D.10 volts, the output changes 5 volts

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Which of the listed sections of an emergency switchboard is used to supply power for alarm signals under emergency conditions?（）

你可能感興趣的試題

When the current in a power transmission line is increased, the power loss （）

An operational amplifier, as used in todays consoles, may have a calculated gain of 5√This means that as the input changes by （）

97免费在线观看视频,亚洲综合自拍网,黄色毛片免费观看,热久久综合网,免费看日产一区二区三区狠狠操av,久久久涩涩涩,在线精品免费视频,人人插天天干,久久91精品国产91久久