由于现金流入而增加的活期存款，通常称为“原始存款”。（）
A．正确
B．错误
参考答案：A
— Has your former classmate come back from America?
— Yes , he________there for eight years.[ ]
A. has stayed
B. stays
C. stayed
D. had stayed
采用电力引爆方法，装炮时距工作面（）以内，应断开电流。
A.20米
B.30米
C.40米
D.50米
