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搜题
【单选题】
颈外静脉是由哪两条静脉汇合而成 ( )A.
颌内静脉与颞浅静脉
B.
面后静脉前支与面前静脉
C.
面后静脉后支与耳后静脉
D.
耳后静脉与颞浅静脉
E.
面前静脉与颌内静脉
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皮皮学刷刷变学霸
举一反三
【简答题】已知液压缸的活塞有效面积为 A,运动速度为v,有效负载为F L ,供给液压缸的流量为 q,压力为p。液压缸的总泄漏量为Δq,总摩檫阻力为F f 。试根据液压马达的容积效率和机械效率的定义,分析液压缸的容积效率和机械效率。
【单选题】2 According to the survey, what jobs are available to those dropouts?
A.
Jobs that are very dangerous.
B.
Jobs that are low-paying and boring.
C.
Jobs that have little chance of success.
D.
Jobs that require long working hours.
【单选题】2 According to the survey, what jobs are available to those dropouts? A. Jobs that are very dangerous. B. Jobs that are low-paying and boring. C. Jobs that have little chance of success. D. Jobs that ...
A.
B.
C.
D.
D
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