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Unit 1 介绍 Introduction
1
Working medium in pump is liquid, but in fan is gas.
喵查答案:正确
错误
Unit 2 分类和基本性能参数 Classification and basic performance parameters
1 Stat……继续阅读 »
1 Which of the following could explain an increase in the unemployment rate and the number of employed people:
Less people are actively looking for work
The school leaving age h……继续阅读 »