正确答案: D
sealed off
题目:During repair,lubrication lines and orifices must be ().
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学习资料的答案和解析:
[单选题]缩短早期故障期的手段是()。Ⅰ.制造时的质量控制;Ⅱ.使用初期的良好磨合;Ⅲ试验时的精心测量
Ⅰ+Ⅱ
[单选题]In the four-stroke engine, it takes () to make one power stroke.
two revolutions
[单选题]White smoke exhausting from an operating diesel engine may indicate ().
a cracked liner