A. 矿中含大量碳酸盐 B. 矿浆中含大量有机物 C. 矿中含大量倍半氧化物 D. 矿中含大量钾、钠盐
A. 佩戴防护镜 B. 戴手套 C. 穿工作服 D. 防止烫伤
A. In open air B. Inside cabins near the overhead C. In the machinery space near the engine air intake D. Underwater
A. 正确 B. 错误