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【单选题】
He is not seriously ill, but only a ____ headache.
A. obvious
B. delicate
C. slight
D. temporary
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答案
C
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在易污染的环境中,低速或中速球和滚子轴承,要把轴承盖里___填满。
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一个完整的液压系统由___。
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317液压系统按液流循环方式的不同,可分为___液压传动系统。
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开式系统是指系统中___的油泵从油箱吸油。
A. 接到油箱;
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在液压传动的基本参数中,流量Q 与速度U 的关系为___,其中A 为面积。
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液压系统不适合于___要求严格的机械。
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液压执行部分是将___。
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液压系统是借助___将功率传送一定距离的系统。
A. 流量;
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容积式液压传动的特点是外部负载越大,其工作压力___。
A. 与外部负载无关;
B. 不变;
C. 越低;
D. 越高。
【单选题】
液压传动___容易控制。
A. 压力方向和流量;
B. 泄漏噪声;
C. 温度;
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【单选题】
油泵标牌上标注的油量是在___下,油泵的实际流量。
A. 最大压力;
B. 额定压力;
C. 实际压力;
D. 出口压力。
【单选题】
油泵的流量取决于工作空间可变容积的大小,与___无关。
A. 压力;
B. 转速;
C. 时间;
D. 比重。
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油泵按流量特性可分为___两种。
A. 定量泵和变量泵;
B. 叶片泵和柱塞泵;C、齿轮泵和叶片泵; D、多级泵和单级泵。
【单选题】
___可调解的泵是变量泵。
A. 排量;
B. 直径;
C. 压力;
D. 方向。
【单选题】
为了提高泵的流量均匀性和运转稳定性,可采用的齿轮泵为___。
A. 正齿轮;
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