钢芯铝绞线，断一股钢芯，或铝线部分损坏面积超过铝线导电部分面积的（）时，必须重接。
A.30％
B.40％
C.25％
D.10％
参考答案：C
—The light in his office is still on. Do you know ?
—In order to prepare for tomorrow’s meeting.
A．if he works hard
B．why he stays up so late
C．that he is so busy
D．when he will stop working
受益人
