主轴中心线与床身导轨的平行度的检测用（）进行。
A.框式水平仪检测
B.拉表检测
C.方尺检测
D.激光干涉仪检测
参考答案：A
导演：电影
A．售货员：货物
B．作家：小说
C．农民：庄稼
D．工人：机器
________ he has limited technical knowledge, the old worker has a lot of experience. [ ]
A. Since
B. Unless
C. As
D. Although
