接触法生产H2SO4的过程中，对废气、废液、废渣和“废热”的处理正确的是（ ）
①尾气用氨水处理 ②污水用石灰乳处理
③废渣用来造水泥、炼铁 ④设置“废热”锅炉产生蒸汽，供热或发电。
| A．只有①② | B．只有①③④ | C．只有①②③ | D．全部 |
相关试题
Jenny nearly missed the flight______ doing too much shopping.
| A．as a result of | B．on top of | C．in front of | D．in need of |
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| A．other | B．others | C．one | D．ones ks |
I’m sure that your letter will get______ attention. They know you’re waiting for the reply. 
| A．continued | B．immediate | C．careful | D．general |
All the dishes in this menu, ______ otherwise stated, will serve two to three people. 
| A．as | B．if | C．though | D．unless |
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