问题 问答题 简答题

自阀调整部是怎样向均衡风缸充气的?充气后的保压又是怎样形成的?

答案

参考答案:

均衡风缸的压力受调整弹簧和调整凸轮来控制的,当自阀手把在运转位时,均衡风缸压力低于规定值时,可以通过调整手轮,压缩调整弹簧、迫使调整阀膜板右移,关闭排气阀,顶开供气阀,使总风向均衡风缸充气,直至达到规定压力为止。

随着均衡风缸和调整阀膜板右侧的压力逐渐增加,调整弹簧被逐渐压缩,调整阀膜板和调整阀座相继向左移,排气阀和供气阀受供气阀弹簧的作用也同时左移,故排气阀口不会打开,供气阀口的开度逐渐减小,最后关闭供气阀口呈均衡风缸充气后的保压状态。

单项选择题
单项选择题

Regardless of their political affiliation, in all countries women must overcome a host of stumbling blocks that limit their political careers. "Most obstacles to progress consist of (1) of various kinds," says the Inter-Parliamentary Union (IPU), a Geneva-based organization (2) 139 parliaments, including the lack of time, training, information, self-confidence, money, support, motivation, women’s networks and solidarity between women.

In every culture, prejudice and stereotypes (3) hard. The belief still holds (4) that women belong in the kitchen and (5) the children, not at election (6) or in the Speaker’s chair. The media often reinforce traditional images of women, who, upon entering politics, also bear the brunt (正面冲击) of verbal and physical (7) .

In impoverished (贫穷的) countries (8) by civil conflicts and deteriorating economic and social conditions, women are (9) by the tasks of managing everyday life and looking after their families.

The IPU stresses the general lack of child-care facilities—often (10) a privileged few—the (11) of political parties to change the times and running of meetings and the weak backing women receive from their families. That support, which is (12) as well as financial, is (13) vital because women have internalized (14) images of themselves since the (15) of time and often suffer from low self-confidence.

Another obstacle is the lack of financial resources, especially as election campaigns become increasingly expensive. (16) , women encounter more or less open machismo (男子汉的高傲) in the (17) of closed political circles (18) entry to the "second sex. " Lastly, they (19) the lack of solidarity between women, (20) by the fact that the number of available positions is limited.

4()

A.sway

B.water

C.truth

D.proof