单项选择题
A.Both；and B.Neither；nor C.Either；or D.Both；or
（） device is provided to prevent starting air from bein...
单项选择题（） device is provided to prevent starting air from being admitted to the cylinder before the reversing is completed.
A.An automatic B.A transmission C.A self-regulating D.An interlocking
（） are generally formed in the frame of the both in-lin...
单项选择题（） are generally formed in the frame of the both in-line and Vee engines to give maintenance access to the crankshaft main and connecting rod large end bearing.
A.Doors B.Aspirate gauzer C.Coupling D.Blind
（） are commonly used in mechanical-hydraulic governor（调...
单项选择题（） are commonly used in mechanical-hydraulic governor（调速器） to sense engine speeds.
A.Bulbs B.Bulks C.Flyweights D.Flywheels
