自动线作业钻杆被卡时推动钻具时应如何处理?
参考答案:自动线作业钻杆被卡时推动钻具时应手扶钻具上表面推动钻具。
—Do you know ________ man standing there?
—I only know he's from ________ European country. [ ]
A. a; an
B. the; the
C. the; a
D. a; the
圆形舌针纬编机的机号是以针筒圆周上的()的织针数来表示。