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搜题/搜资源
【判断题】【消耗次数:1】
He had his leg break when he slipped on a piece of ice.
①
正确
②
错误
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【单选题】
20. Only when he had handed in his exam paper ____ he had made several mistakes.
①
he has realized
②
does he realize
③
has he realized
④
did he realize
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【单选题】
3. He had to ______ his past actions when he retired, or he would be punished.
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consider
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account for
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It was not until he arrived in class _____ realized he had forgotten his book.
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when he
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that he
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and he
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【单选题】
22. One day while Mr. King was working, he had a/an ____: his left leg was badly injured.
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business
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accident
③
matter
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event
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【单选题】
He was _____ his late twenties when he found his first job.
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in
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after
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after
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from
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【单选题】
That young boy couldn’t move because he _______ his leg.
①
breaks
②
broke
③
had broken
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【单选题】
He didn’t keep on asking me the time any longer as he had had his watch ____.?
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repaired ?
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to repair ?
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repairing ?
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repair?
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【判断题】
答题说明:句子没有语法错误请选择“正确”,有语法错误请选择“错误”Hardly he had entered the room when he was asked to leave the room at once.
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When we came back, he found his bicycle ____
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was stolen
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had stolen
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had been stolen
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is stolen
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【单选题】
When he came to,he found himself________on a chair,with his hands________back.
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to sit;tying
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sitting;tying
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seating;tied
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seated;tied
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随机题目
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压力控制回路的功用是使系统保持在某一规定的准确压力值。
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通常将快速排气阀直接安装在气缸的排气口上,可用于加快气缸的运动速度。
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正确
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【判断题】
速度控制回路只能采用节流阀或单向节流阀来调节气缸进、排气管路的流量,从而控制气缸速度。
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【判断题】
气—液联动速度控制回路以气压作为动力,利用气液转换器或气液阻尼气缸控制执行元件的运动速度,从而得到良好的调速效果。
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系统中压力过高,会增加压缩空气输送过程中的压力损失和泄漏。
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正确
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气压系统的元件安装应注意阀的推荐安装位置和标明的安装方向。
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正确
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【判断题】
无论气压系统多么复杂,均由一些具有不同功能的基本回路组成。
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正确
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错误
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【单选题】
气压系统中出现气缸爬行的原因不可能是( )。
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负载过大
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气压不足
③
气缸内泄露严重
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负载过小
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【单选题】
对气压装置气源入口处压力进行调节的二次压力控制回路一般由空气过滤器、( )和油雾器组成。
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溢流阀
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换向阀
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节流阀
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【单选题】
当a或b任一孔有气信号时,S口就有输出的逻辑元件是( )。
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与门
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或门
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禁门
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三门
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