硫酸亚铁隔绝空气加强热分解形成四氧化三铁，将分解生成的气体通入氯化钡溶液中，下列叙述正确的是
| A．产生BaSO4沉淀 | B．产生BaSO3沉淀 |
| C．产生BaSO4与BaSO3的混合沉淀 | D．无沉淀产生 |
相关试题
Progress______ so far very good and we are sure that the work will be finished on time.
| A．was | B．had been | C．has been | D．will be |
Charles was alone at home, with_______ looking after him.
| A．someone | B．anyone | C．not one | D．no one |
It is often ______ that human beings are naturally equipped to speak.
| A．said | B．to say | C．saying | D．being said |
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