单选题
The cylinder liners are made of _____ and the cylinder surfaces are sometimes chromium-plated.
题目答案
C
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答案解析
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The cylinder liners are made of _____ and the cylinder surfaces are sometimes chromium-plated.
When the refrigeration demand is small,_______.
_____ allows for expansion and water make up in the water cooling system.
下列泵调节流量适合采用节流调节的是________。
当柴油机燃用劣质燃油时,喷油器的冷却介质多使用()。
检验前必须对舱内进行(),以满足人员进舱要求。