爆破前应检查工作面附近()的瓦斯浓度，超过1%就不能爆破。

职业发展阶段中的确立阶段由()三个子阶段构成。A探索子阶段B.稳定子阶段C维持子阶段D职业中期危机阶段 点击查看答案

The author points out that refrigerators______.A．have become more and more advancedB．consume less power than ever beforeC．are responsible for global warmingD．initiate carbon-reducing campaign 点击查看答案