正确答案: A
A.Ⅱ+Ⅲ+Ⅳ
题目:针阀偶件过度磨损的部位发生在()上。Ⅰ.端面配合面;Ⅱ.喷孔;Ⅲ.圆柱配合面;Ⅳ.锥面配合面;Ⅴ.针阀体锥面。
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学习资料的答案和解析:
[单选题]A: Please tell me the specifications and quantity.B: ()
300 tons of 180 cst fuel oil
[单选题]The main bearings are provided with thin-walled (), lined with a copper-lead alloy.
steel shells