某理想气体经历了一个内能不变的热力过程，则该过程中工质的焓变( )。
A．等于零
B．大于零
C．小于零
D．等于1
参考答案：A
-Why not have a new machine designed?
-_______ . I'll have someone do it soon. [ ]
A. I don't think so
B. I'm not sure
C. It's up to you
D. Sounds like a good idea
关节内骨折最常见的并发症是
A．创伤性关节炎B．缺血性骨坏死C．骨化性肌炎D．骨生成异常E．骨折不愈合
