以下()场所的接地干线，应有两处以上与接地体连接。
A.火灾危险环境
B.变配电所
C.非爆炸性气体环境
D.消防控制室
参考答案：A, B
_______for us to discuss the problem again.It has already been settled.[ ]
A. It has no doubt
B. There has no doubt
C. It is no need
D. There is noneed
碳酸钙抗酸，待作用消失后
A．可产生黏膜保护作用B．可致腹泻C．可引起碱血症D．可引起反跳性胃酸分泌增多E．可引起排尿困难
