何谓热补偿？
参考答案：
当管路的热应力超过许用应力时，使需要寻求减少热应力的方法。
There has been no _____ so far from the police about the cause of the poor girl's death after the college
entrance examination. [ ]
A. comment
B. command
C. discussion
D. reaction
环境温度为20℃时，桑塔纳轿车点火线圈初级绕组的电阻为（）。
A.0.26～0.52
B.0.26～0.52k
C.0.52～0.76
D.0.52～0.76k
