Small crack in the crankshaft bearing surface of a diesel engine are an indication of____.
A.corrosion fretting
B.insufficient lubrication
C.abnormal wear
D.fatigue failure

The alternating current generator supplying a load has a voltage drop resulted from the loadWhen the load has a lagging power factor this voltage drop _____.A.is smallB.may be neglectedC.is usefulD.is considerable

A.
A.is
B.may
C.is
D.is

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两种()混合出来的颜色被成为间色

A.复色
B.杂色
C.原色
D.浊色

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