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【简答题】
已知某控制阀串联在管道中，系统总压差为100kPa，阻力比为0.5。阀全开时流过水的最大流量为60m 3 /h。阀的理论可调范围为30，假设流动状态为非阻塞流。问该阀的额定(最大)流量系数C max 及实际的可调范围R'为多少?
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【单选题】When did the comic books of today appear?
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【单选题】When did the EU and the US agree to suspend their cases before the US new complaint?
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B.
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【简答题】鸡的输卵管 中,卵子受精处为( );分泌浓稠的白蛋白处为( ); 形成内、外壳膜处为( );形成蛋壳处为( );储存精子处为( )。
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A.
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B.
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