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【单选题】
气动控制元件的作用是( )。A.
产生、处理和储存压缩空气装置
B.
将压缩空气的压力能转换成机械能的装置
C.
将压缩空气的机械能转换成压力能的装置
D.
用来控制压缩空气的压力、流量、方向及执行元件工作程序的元件
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举一反三
【单选题】Before she went abroad she spent as much time as she could ______ English.
A.
practise to speak
B.
practising speaking
C.
practise speaking
D.
to practise speaking
【单选题】．It was a long time before she_________ to what he had said.
A.
caught on
B.
went on
C.
went up
D.
caught up
【单选题】大众桑塔纳 2000型轿车,燃油是通过喷油器喷射在 ( ) 。 A. 燃烧室内; B . 空气滤清器处; C . 节气门处; D . 进气门处
A.
燃烧室内； B . 空气滤清器处； C . 节气门处； D . 进气门处
B.
B . 空气滤清器处； C . 节气门处； D . 进气门处
C.
C . 节气门处； D . 进气门处
D.
D . 进气门处
【单选题】What did Laura do before she went to college?
A.
She went to travel.
B.
She went to work.
C.
She just stayed at home.
D.
She did volunteer jobs.
【单选题】______the house was started before she went to Africa and now it is still under construction.
A.
Working
B.
Working at
C.
Working on
D.
Work on
【简答题】有关流行性出血热的描述正确的是（ ）
【简答题】How did Jane spend her days before she went back to work?
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