()不是超声波探伤的缺点。
A.判断缺陷性质直观性差
B.对缺陷尺寸判断不够准确
C.要求探伤零件表面粗糙度较高
D.要求操作人员具有较高的技术水平和工作经验
参考答案:C
“thanks” is polite when someone has done you a favour, but saying it too often is quite another thing.
A.Though saying
B.If saying
C.Saying
D.In spite of saying
根据《中 * * 党党内法规制定条例》的规定,党内法规经批准后()公开发布。
A.只在党内
B.全国性的可以
C.一般应当
D.一律应当