A 含铁40%的硫化亚铁 B 含钙70%的生石灰 C 含氮35%的硝酸铵 D 含钠37%的食盐

A 35.5 B 63.6 C 40 D 3.55

A 4.6% B 9.2% C 小于4.6% D 大于4.6%

A 33.3% B 50% C 28.6% D 40%

A 1：3 B 3：1 C 4：1 D 1：4

A 61.71% B 38.24% C 60% D 40%

A 1.428g/l B 0.714g/l C 0.364g/l D 0.357g/l

A <img src="https://www.beizhujiaoyu.com/uploads/202208/20130110170481528152.jpg" alt="" border="0" /> B <img src="https://www.beizhujiaoyu.com/uploads/202208/20130110170447484748.jpg" alt="" border="0" /> C <img src="https://www.beizhujiaoyu.com/uploads/202208/20130110170412641264.jpg" alt="" border="0" /> D <img src="https://www.beizhujiaoyu.com/uploads/202208/2013011017040982982.jpg" alt="" border="0" />

A 火柴，烧杯 B 石蕊，试管 C 烧杯，尖口嘴导管，澄清石灰水，火柴 D 烧杯，浓H2S04，酒精灯

A <img src="https://www.beizhujiaoyu.com/uploads/202208/20130110170984158415.jpg" alt="" border="0" /> B <img src="https://www.beizhujiaoyu.com/uploads/202208/20130110170910741074.jpg" alt="" border="0" /> C <img src="https://www.beizhujiaoyu.com/uploads/202208/20130110170973147314.jpg" alt="" border="0" /> D <img src="https://www.beizhujiaoyu.com/uploads/202208/20130110170916671667.jpg" alt="" border="0" />