热缩时，裸纤应位于热缩套管的中间位置，钢棒与纤芯的涂覆层重叠部分每端应不小于（）cm。
A.0.3
B.0.5
C.0.8
D.1
参考答案：C
An unhappy childhood may have some negative effects on a person's character; however, they are not
always ________.[ ]
A. practical
B. avoidable
C. permanent
D. beneficial
两个数相除又叫做两个数的______．
