什么是汽轮机的内功率？
参考答案：
当只考虑扣除汽轮机的各种内部损失，包括进汽节流损失、级内损失和排汽管压力损失后，汽轮机所发出的功率，叫汽轮机的内功率。
There are only three chairs here. We need one _____. [ ]
A. more
B. much
C. another
D. other
His luggage includes two large cases which ________ as much as 50kg.
A．weighs
B．is weighed
C．weigh
D．are weighed
