推力瓦块上巴氏合金厚度应小于通流部分和轴封处最小轴向间隙,国产机组的瓦块巴氏合金厚度一般在()左右
A.0.5mm
B.1.0mm
C.1.5mm
D.2.0mm
参考答案:C
电焊机的接地,电阻不得大于().
A.20
B,10
C.8
D.4
_______ you have got the news about him, I won’t hold it back from you.
A.Even though
B.Now that
C.In case
D.As if