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Activity 3As we know, college education will 1)____students’ opportunities for better jobs in the future. So I’m sure that spending time on study is 2)____. 3)____, study and some 4)____should start from the very beginning of freshman year. The Student Union is a good place where one can develop social skills, get his abilities 5)____, have his competence 6)____and make a lot of friends.

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溢流阀利用__压力来控制阀口启闭。

19.减压阀利用__压力来控制阀口启闭。

就溢流阀的压力流量特性而言,其开启比和闭合比越__则说明其性能越好。

先导式溢流阀的功用是( )

A. 使进出口之间产生恒定的压差
B. 使出口得到低压
C. 使出口压力降低并保持恒定
D. 使进口压力保持恒定或保证系统安全

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