单项选择题

Dual electro-hydraulic steering units usually operate ______．
A.With both pumps on line at the same time
B.With one pump on standby
C.With the follow-up gear disconnected
D.Only when the rudder is moved amidships

A.A.With
B.With
C.With
D.Only
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单项选择题
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单项选择题
How does combustion air enter the cylinder of a two-cycle diesel engine ? Through _______．A.Cylinder head valvesB.PortsC.Turbo chargersD.Bleeder valves
A.A.Cylinder
B.Ports
C.Turbo
C.Bleeder
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