水上紧急撤离，旅客到达出口时，乘务员下达的指令是（）
A. 到这边来，跳，坐
B. 到这边来，充气，跳/登艇
C. 抱紧，防撞
D. 全部都对
摩尔法测定Cl－含量时，要求介质的pH在6.5~10.0范围内，若酸度过高，则（）
AgCl沉淀不完全
B. AgCl沉淀易胶溶，形成溶胶
C. AgCl沉淀吸附Cl－增强
D. Ag2CrO4沉淀不易形成
MV ATLANTIC AT 0205UTC A BLACK FLOATING MINE WAS SIGHTED IN APPROX POSITION LAT 15.30N LONG 112.30E DANGEROUS TO NAVIGATION VESSELS IN VICINITY. According to this cable，the mine（）.
A. has nothing to do with navigation
B. dangerous to navigation
C. the mine is drifting with the wind
D. the mine is not sighted by the vessel
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