当蒸汽在竖壁上发生膜状凝结时，分析竖壁高度h对放热系数的影响。
参考答案：
句型转换
1. Football is more exciting than volleyball. (改为同义句)
Volleyball isn't __________ exciting __________ football.
2. The Tab Bat is 83 yuan and the Bon Bon is 75 yuan. (同上)
The Tab Bat is __________ __________ than the Bon Bon.
3. We prefer basketball to volleyball.(同上)
We like basketball __________ __________ volleyball.
4. I think the white ones are cheaper than the black ones. (改为一般疑问句)
__________ __________ think the white ones are cheaper than the black ones?
5. They play their CDs loudly. (就画线部分提问)
__________ __________ they play their CDs?
拉苏莫夫研究认为，正常生产时，水力旋流器沉砂咀标准单位负荷应为（）t/cm2.h。
A、5－10
B、0.5－2.5
C、20－50
