定位的任务是要限制工件的().
参考答案:自由度
Everybody was touched __________ words after they heard her moving story.
A.beyond
B.without
C.of
D.in
锻件探伤时,那些因素会在荧光屏上产生非缺陷回波?()
A、边缘效应
B、工件形状及外形轮廓
C、迟到波
D、以上全部