题目内容

I.Fill in the gaps with words or phrases given in the box. Change the form where necessary.reality fabricstimulatebeyond doubt if anything underminepresence loose messconcentration inspiration accordinglytrifle intuition cautionat the turn of the century1) Amy is an expert in her field, and is well-paid ________________.2) Some parents feel that the school structure is a bit ___________, allowing children too much freedom when choosing learning tasks.3) She needed all her powers of ___________________ to stop herself from slipping on the icy road.4) Monetary policy hasn't been working because interest rates have been reduced to almost zero without ___________________ the economy.5) It's the strongest natural ____________ and can stand very high temperatures and be machine washed.6) So far as I know that people's tastes haven't changed much, and, ________________, they are getting more diverse these days than they used to be.7) It's easier to find excuses for poor customer service than accept ____________ and do something about it.8) Often there's no clear evidence one way or the other and you just have to base your judgment on ______________.9) He was dressed very casually, which made him look a ___________ out of place at the reception.10) My grandfather was born in Hong Kong _____________________ and moved with his family to Britain in the early 1920s.11) We love having our grandchildren visit, but they always leave such a _________ for us to clean up afterwards.12) His mother died in the accident, too. But we didn't tell him the news as we were afraid that would _______________ his confidence in full recovery.

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单位湿空气中所含的水蒸气质量称为。

A. 绝对湿度
B. 饱和绝对湿度
C. 相对湿度
D. 含湿量

是将原动机所输出的机械能,转换成气体压力能的装置。

A. 气源装置
B. 辅助元件
C. 执行元件
D. 控制元件

一定质量的气体,在状态变化过程中与外界完全没有热交换,这种过程称为。

A. 等容过程
B. 等温过程
C. 绝热过程
D. 多变过程

当马赫数大于1,即气流速度大于声速时,气体的流动状态为超声速流动。

A. 亚声速流动
B. 超声速流动
C. 快速流动
D. 临界流动状态

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