漆膜的击穿电压强度能反映漆膜承受过电压的能力，它取决于漆膜的品种、厚度、涂覆质量和导电线芯的电流强度。
参考答案：错
—There's somebody at the door. Who _____ it be? Is it a postman?
—No, It _____ be him. It's just seven o'clock. It's too early. [ ]
A. may; can't
B. will; won't
C. may; must
D. must; may not
根据光接入网（OAN）参考配置可知OAN由（）组成。
A、OLT OBD ONU
B、OLT ODN ONU
C、OLT ONU
D、OLT OBD
