题目内容

Students’ pressure sometimes comes from their parents. Most parents are 1._____________, but some of them aren’t very helpful with the problems their sons and daughters have in 2.________ college, and a few of them seem to go out of their way to add to their children’s difficulties.For one thing, parents are often not 3.____________ the kinds of problems their children face. They don’t realize that the 4.____________ is keener, that the required standards of work are higher, and that their children may not be prepared for the change. 5._____________to seeing A’s and B’s on high school report cards, they may be upset when their children’s first semester college grades are below that level. At their kindest, they may 6._____________inquire why John or Mary isn’t doing better, whether he or she is trying as hard ad he or she should, and so on. At their worst, they may 7._____________ to take their children out of college, or 8.______ funds.Sometimes parents regard their children as extensions of themselves and think it only right and natural that they determine what their children do with their lives. In their involvement and 9.________________ with their children, they forget that everyone is different and that each person must develop in his or her own way. They forget that their children, who are now young 10.____________, must be ones responsible for what they do and what they are.

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下列控制阀中,不属于压力控制阀的是()。

A. 溢流阀
B. 减压阀
C. 节流阀
D. 顺序阀

减压阀起作用时出口压力比进口压力()。

A. 大
B. 小
C. 相等
D. 不确定

调速阀是由节流阀与()而成的组合阀。

A. 定差减压阀串联
B. 顺序阀串联
C. 定差减压阀并联
D. 顺序阀并联

与节流阀相比,调速阀的显著特点是()。

A. 最小压差的限制较小
B. 调节范围大
C. 流量稳定性好
D. 结构简单,成本低

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