5P6×6K2探头各符号所表示的意义是什么?
参考答案:
5—频率为5MHz:
P—锆钛酸铅陶瓷:
6×6—矩形晶片6mm×6mm:
K2—K值斜探头,K=2。
She_______ go to bed_______ her mother came back. [ ]
A. didn't ; until
B. doesn't ; until
C. didn't ; after
D. doesn't ; after
Je4B3253钻进过程中,随着金刚石尖棱的磨钝,钻压应逐步减小。