Diesel engines are started by supplying （） into the cylind

【名词&注释】

铝合金(aluminum alloy)、螺旋桨(propeller)、轴系理论中心线、铜铅合金(copper-lead alloy)

[单选题]Diesel engines are started by supplying （） into the cylinders in the appropriate sequence for the required direction.

A. cooling water
B. compressing air
C. compressed air
D. cylinder oil

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学习资料：

[单选题]轴系理论中心线是（）的定位安装基准。

A. 螺旋桨
B. 舵系
C. 中间轴
D. 主机

[单选题]油润滑艉轴承材料常采用（）耐磨合金。

A. 铜铅合金^{(copper-lead alloy)}
B. 锡青铜
C. 高锡铝合金
D. 白合金

[单选题]In general, （） is suitable for delivering small quantities at high pressure.

A. reciprocating pump
B. gear pump
C. centrifugal pump
D. vane pum

[单选题]It is important that the water （） very often as this can lead to increased deposits.

A. not be changed
B. be changed
C. should not be changed
D. should be changed

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