当（）发生火灾时应进行全矿井反风。
A、井底车场
B、进风巷
C、回风巷
D、采掘工作面
参考答案：A
属于物理吸附的是（）
A.硅胶对黄酮的吸附
B.氧化铝对生物碱的吸附
C.氧化铝对黄酮的吸附
D.聚酰胺对黄酮的吸附
E.活性炭对环烯醚萜苷的吸附
–What did the radio say just now?
- Sorry. I didn’t catch it. I _____ something else.
A．think
B．will think
C．was thinking
D．had thought
