单项选择题
Valve gear knocks are more easily located while the engine （）.
A.is running
B.stops
C.is repaired
D.lacks of oil
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单项选择题
VIT means （）
A.variable injection timing
B.variable inlet tonnage
C.vertical incoming tonnage
D.vertical inlet tank -
单项选择题
Under manoeuvring condition the main engine may run on （）.
A.gas oil
B.marine diesel oil
C.residue oil
D.crude oil -
单项选择题
Two-stroke engine turbocharging is achieved by two distinct methods, （） termed the constant pressure and the pulse system.
A.respectable
B.respectful
C.respective
D.respectively
