在汽轮机热力试验中,试验条件下,在各热平衡方程式中,回热抽汽的热焓,应按加热器进口的温度和压力的测量值确定()
参考答案:对
The government claims that the economy is improving, but this survey suggests ______. [ ]
A. moreover
B. therefore
C. otherwise
D. meanwhile
刮板输送机司机的危险源有哪些?