正确答案: A
液压油
题目:液压拉伸器的液压系统中应使用纯净的()。
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学习资料的答案和解析:
[单选题]在早期故障内故障率比较(),但它随时间的推移而()。
高/减少
[单选题]平板形舵可作成()。Ⅰ.平衡舵;Ⅱ.穿心舵轴平衡舵;Ⅲ.半平衡舵;Ⅳ.不平衡舵;Ⅴ.完全平衡舵。
Ⅰ+Ⅲ+Ⅳ
[单选题]In a four-stroke engine the camshaft rotates at ().
half the engine speed
[单选题]Turbocharging of marine diesel engine is achieved by two distinct methods, () termed the constant pressure and the pulse system.
respectively