问题
单项选择题
透平式压缩机属于（）压缩机。
A、往复式
B、离心式
C、轴流式
D、流体作用式
答案
参考答案：B
搜题请搜索小程序“爱下问搜题”
透平式压缩机属于（）压缩机。
A、往复式
B、离心式
C、轴流式
D、流体作用式
参考答案：B
| 补全对话。 | |
| A: 1______ B: I'm reading a book on population. It says 259 babies are born every minute. A: 2______ I can hardly believe it. Multiply this by (乘以) 60, we'll have 15,540 babies on the earth in an hour. B: 3______ Hour after hour, day after day, just think how many more people there will be in one year. The world's population is increasing fast. A: The population in less developed countries (欠发达) is growing faster than that in developed countries, isn't it? B: 4______ Population is a greater challenge (挑战) in developing countries than in developed countries. A: 5______ B: Yes. The State Family Planning Commission (委员会) of China was founded in 1964. The population increase rate (入口增长率) had dropped from 23% in 1953 to 11.35% in l965.
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