题目内容：
在正常工作条件下，滚动轴承的主要失是
参考答案：
选择题：在正常工作条件下，滚动轴承的主要失是
- 题目分类：华北水利水电大学-机械设计基础
- 题目类型：选择题
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He is worth ____________.
He is worth ____________.选择一项：A. trustB. trusted C. trusting
1. Parents are too busy to spend time teaching the
1. Parents are too busy to spend time teaching their kids right from wrong. 回答 A
斜齿圆柱齿轮的齿数z与模数mn不变，若增大螺旋角β，则分度圆直径d1（ ）
斜齿圆柱齿轮的齿数z与模数mn不变，若增大螺旋角β，则分度圆直径d1（ ） A.增大 B.减小 C.不变 D.不一定增大或减小
Zhang Hua had an oral contract with _________.选择一项
Zhang Hua had an oral contract with _________.选择一项：A. 2 Construction and Install
Both the kids and their parents __________English,
Both the kids and their parents __________English, I think. I know it from their