钢中硫的有害影响主要是(),磷的有害影响主要是()。
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电解液注入蓄电池内以后,要静止放置5~8h,才能进行充电。
A. 正确
B. 错误
矸石装车前,平巷内要用木楔掩稳矿车,也可以用煤、岩块稳车
A. 正确
B. 错误
The buoy symbol printed on your chart is leaning to the northeast. This indicates ().
A. you should stay to the north or east of the buoy
B. you should stay to the west or south of the buoy
C. the buoy is a major lighted buoy
D. nothing special for navigational purpose
禁止用吊钩、抓斗载运()。当司机离开垃圾吊、渣吊、汽机行车时,应将()或将();较长时间离开时,还应将驾驶室的()。