正确答案: B
Ⅰ+Ⅱ+Ⅳ+Ⅴ
题目:水润滑艉轴承的轴承材料有()。Ⅰ.铁梨木;Ⅱ.橡胶;Ⅲ.铜合金;Ⅳ.层压胶木;Ⅴ.合成材料。
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学习资料的答案和解析:
[单选题]船上吊缸检修一般不必()。
拉出气缸套进行磁粉探伤
[单选题]() of the A-frames there is a strong cast iron frame called the scavenging air box.
At the top
[单选题]The injector pump is operated by a cam which drives the () up and down.
plunger