【单选题】【消耗次数：1】
常用的快速回路包括：液压缸差动连接回路；采用蓄能器的快速运动回路；双泵供油回路；用增速缸的快速运动回路。该说法（ ）
①
正确
②
错误
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液压传动系统中的速度控制回路包括调节液压执行元件的速度的调速回路、使之获得快速运动的快速回路、快速运动和工作进给速度以及工作进给速度之间的速度换接回路。该说法（ ）
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容积调速回路通常有三种基本形式：变量泵和定量液压执行元件组成的容积调速回路；定量泵和变量马达组成的容积调速回路；变量泵和变量马达组成的容积调速回路。该说法（ ）
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随机题目
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I haven’t finished my composition . I ________ for two hours and a half.
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have written it
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have been writing it
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wrote it
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am writing it
【单选题】
I will __________ here till you give me some money.
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leave
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not leave
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come
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return
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“ Has he seen this film ? ” “Yes. He _________ it several days ago.”
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saw
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has seen
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had seen
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A hunter is a man who __________ animals.
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catch
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catches
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will catch
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was catching
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These children are _________ this year than they were last year.
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moretall
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moretaller
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verytaller
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muchtaller
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Yourroomis _______ thanmine.
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three time big
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threetimesbig
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threetimesbigger
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biggerthreetimes
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This book is ________ that one. But __________ than that one.
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as difficult as ;expensive
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as more difficult as ; more expensive
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as difficult as ; more expensive
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more difficult as ; as expensive
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This box is ________ that one.
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heavy than
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so heavy than
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heavier as
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as heavy as
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-Whats your brother like?
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adriver
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very tall
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myfriend
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