If the compression ratio is increased on any diesel engine, ________.
A.the expansion ratio will decrease
B.combustion will be slowed down
C.thermal efficiency will decrease
D.thermal efficiency will increase
第1题
A.Special tools are required for lapping or grinding
B.It is impossible to throttle flow with a butterfly valve
C.To close the valve, it is only necessary to turn the handle a quarter of a turn
D.The butterfly valve should never be used in a freshwater system
第2题
A.one-half engine speed
B.the same as engine speed
C.twice engine speed
D.four times engine speed
第3题
A.the main engines
B.the auxiliary engines
C.the emergency generator engine
D.the auxiliary engines and the main engine(s)
第4题
A.open / “stop”
B.closed / “stop”
C.open / “start”
D.closed / “start”
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