INFILE语句用于从外部文件读入数据,必须出现在( )语句之前
A.OUTPUT
B.INPUT
C.INTO
D.END
E.IFTHEN
参考答案:B
Mike wasn’t at home yesterday. He ______to give us a lecture.
A.is inviting
B.is invited
C.was inviting
D.was invited
车木的线型不一致,凹凸台阶不匀称,则应( )加工,若无法改正,则应换去此杆件,重新加工,直至合格达标成型。
A.开槽覆盖
B.深化车削
C.缩小断面
D.重复割削