潜污泵（）之间是静密封。
A.电机输出轴与泵体
B.电缆和接线盒
C.上下壳体
D.电机壳体与泵体
参考答案：B, C, D
31. All his attention______on the computer game, so he even didn't notice his mother enter the room.
A．has been fixed
B．was fixing
C．was fixed
D．Fixed
客户办理哪些业务须填写存取款凭单（）。
A.子账户存款2000元
B.主账户存款5000元
C.主账户取款2万元
D.子账户取款3000元
