在钻进操作中,认真做好“三看”、“二听”、“一及时”。所谓“一及时”是指()
A、及时测量进尺
B、及时排水
C、发现异状及时处理
D、及时交接班
参考答案:C
Home to ______ and gangsters, officials and laborers, refugees and artists, the city was, in its prime, a metropolis that exhibited all the hues of the human character.
A.magnates
B.magnets
C.machines
D.magnitudes
齿轮泵端面密封垫片的作用是()
A.密封
B.调整端面间隙
C.密封和调整端面间隙
D.防止吸排沟通