_______control system is one in which the control action is independent of the output.
A.Feed back
B.Negative feed back
C.Close loop
D.Open loop
第1题
A.alternator
B.glass thermometer
C.bourdon tube
D.piezoelectric pressure transducer
第2题
A.the tach generator
B.either the coupling or shaft
C.a small bulb attached to the shaft
D.a piece of reflective tape
第3题
A.ultra much space
B.universal medium system
C.unit machined space
D.unattended machinery space
第4题
A."prepare to stop the engine"
B."assemble an engine on its bedplate"
C."make an engine ready for starting"
D."dismantle an engine"
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