“一炮三检”是指装药前、()和()必须检查放炮地点附近的瓦斯浓度。
参考答案:放炮前;放炮后
肝性脑病的发病机制中氨中毒的主要机制是()
A.干扰脑的血液循环
B.干扰脑的能量代谢
C.抑制神经递质
D.兴奋神经递质
E.抑制神经传导
I don’t think English is __ a language as Russian.
A.difficult as
B.as difficult
C.more difficult
D.difficult