题目内容

Anoperationalamplifier,asusedintodaysconsoles,hasacalculatedgainof5Thismeansthatwhentheinputchanges（）

A. 5volts,theoutputchanges10volts
B. 10volts,theoutputchanges5volts
C. 2volts,theoutputchanges10volts
D. 10volts,theoutputchanges2volts

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Anoperationalamplifier,asusedintodaysconsoles,hasacalculatedgainof5Thismeansthatwhentheinputchanges（）

A. 5volts,theoutputchanges10volts B. 10volts,theoutputchanges5volts C. 2volts,theoutputchanges10volts D. 10volts,theoutputchanges2volts

UniversalmotorswilloperateonACorDCcurrent,andaregenerallyfoundin（）

Todeterminewhatnavigationlightsandday-shapesmustbedisplayedonmobileoffshoredrillingunitsundertow，youshouldcheckthe（）.

机器和机构的总称是（）。

WhatistheperiodofvalidityoftheSOLASrequiredCargoShipSafetyConstructionCertificate?（）

A. 5volts,theoutputchanges10volts
B. 10volts,theoutputchanges5volts
C. 2volts,theoutputchanges10volts
D. 10volts,theoutputchanges2volts