单项选择题

Diesel engines obtain combustion air through turbo chargers，blowers，or ______．
A.Air starters
B.Carburetors
C.Natural aspiration
D.Air receivers

A.A.Air
B.Carburetors
C.Natural
C.Air
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单项选择题
设 是来自 的一个样本， ， ， 。则下列选项一定正确的是（ ）。
A．
B．
C．
D．
单项选择题
Dual electro-hydraulic steering units usually operate ______．A.With both pumps on line at the same timeB.With one pump on standbyC.With the follow-up gear disconnectedD.Only when the rudder is moved amidships
A.A.With
B.With
C.With
D.Only
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