分三相单投闸门,须用绝缘棒操作,并配上绝缘手套()
A. 先合左右二相
B. 先合中间一相
C. 三相一起合
D. 先合右相后合中相
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《百条严禁》规定:“严禁私自保管或使用已停用的()”。
A. 空白重要凭证
B. 有价单证
C. 会计核算专用印章
D. 密押机具
铝土矿按氧化铝结晶形态可分为()、()、()等三种基本形态。
屋面防水层用细石混凝土作保护层时,细石混凝土应留设分隔缝,其纵横间距一般最大为6m。
A. 正确
B. 错误
On a vessel,if someone fell overboard and you did not know over which side the person fell,you should().
A. immediately reverse the engines
B. stop the propellers from turning and throw a ring buoy over the side
C. increase speed to full to get the vessel away from the person
D. first put the rudder hard over in either directio