正确答案: C

compressed air

题目：Diesel engines are started by supplying （） into the cylinders in the appropriate sequence for the required direction.

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学习资料的答案和解析：

[单选题]轴系理论中心线是（）的定位安装基准。

主机

[单选题]油润滑艉轴承材料常采用（）耐磨合金。

白合金

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

reciprocating pump

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

not be changed