露天开采不需掘进大量的()。
A、围石
B、峒室
C、矿山工程
D、井巷
参考答案:D
镇患者呼吸困难的特点是
A.深大呼吸
B.呼吸浅慢
C.常伴哮鸣音
D.三凹症阳性
E.咳粉红色泡沫痰
It was in the factory ________ his friend worked ________ he picked up a lot of experience. [ ]
A. where; where
B. that; where
C. that; that
D. where; that