井巷
参考答案:
为进行采掘工作在煤层或岩层内所开凿的一切空硐。
A University is_____ place where you can learn to be wise, learn to be confident and learn
to make _____ difference.[ ]
A. a; /
B. a; a
C. the; /
D. the; the
简述老化。