Which of the statements listed concerning heat transfer is correct?（）
A. Heat is always transferred at a constant rate
B. Heat transfer rate increases as temperature difference increases
C. The rate of heat transfer is not affected by temperature difference
D. The high temperature region is known as a heat sink
查看答案
敌对进路指在联锁范围内的固定进路，如果不能以（）分开敌对关系的都是敌对进路。
丈量斜距推算水平距离时，可根据倾斜角按三角函数计算或根据高差按勾股定理计算。
A. 正确
B. 错误
为防止发生触电危险，试压泵、鼓、引风机出现故障时，应由哪种作业人员故障排除？
干线子系统垂直通道有电缆孔、管道、电缆竖井三种方式可供选择，宜采用（）方式。
A. 管道
B. 电缆竖井
C. 电缆孔
D. 电缆手井
微信支付 
支付宝支付