题目内容

液压马达和液压泵在工作原理上是可逆的，所以在实际结构上()

A. 所有的泵都能作马达使用
B. 只有少数泵能作马达使用
C. 所有的泵不能作马达使用
D. 所有的马达都可作泵使用

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液压泵和液压马达的排量是一个()

A. 由结构和尺寸决定的量
B. 随泄漏而变化的量
C. 随转速而变化的量
D. 随驱动转矩而变化的量

液压马达工作运转时，输入油液的压力大小取决于()的数值。

A. 液压马达的排量
B. 液压马达驱动件的阻力矩
C. 安全阀的调定压力
D. 液压马达的转速快慢

Activity 2My First Year Life in CollegeThe main idea: My first year in college is not free, but full of 1). My college life experience: Before entering college The adults around always tell me that college life is free and 2) .When studying in college A) My life is mainly made up of two parts - study and 3) . B) I’ m sure that spending time on study is 4) . What I’ve gained in college The chance will just come only if you have a 5) mind.

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.