交流耐压试验能有效的发现电器设备存在的较危险的（）缺陷。
A、表面
B、破损
C、集中性
D、零散
参考答案：C
选择与画线部分意思相同或相近的选项。
— Thanks very much for your help.
— It's a pleasure. [ ]
A. That's right.
B. It doesn't matter.
C. Right.
D. You're welcome.
