说明离心式压缩机DA220-71的意义是什么？_爱下问搜题

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问题问答题简答题

说明离心式压缩机DA220-71的意义是什么？

答案

参考答案：

DA：表示单吸入离心压缩机.1：设计顺序号.

220：第一级吸入状态下的流量，米/分.7：叶轮级数.

填空题

一个圆锥的体积是20dm³，高是12dm，底面积是______dm²．

补全对话，情景问答

交际英语，完成对话。请注意有一项是多余的。

A. Do you sleep well?
B. Do you do exercise?
C. Do you often have breakfast?
D. What's the matter, madam?
E. You are not ill.
F. When did you start?

A:     1
B: I feel weak. I can hardly do any work, doctor.
A:      2
B: A month ago.
A: Do you have a headache?
B: No, I don't.
A:      3
B: Yes, I sleep very well.
A:      4
B: No, I don't. And I have little food for lunch
    because I want to keep thin.
A: Oh, I see.     5
    You don't need to take medicine.
    You need to eat more food and do some exercise every day.
    Then you can be better soon.
1._____ 2._____ 3._____ 4._____ 5._____