主页
学科
搜索
账户
常见问题
当前学科:汽车发动机总体构造和工作原理
题目:
问答题
气门弹簧起什么作用?为什么在装配气门弹簧时要预先压缩?对于顶置式气门,如何防止弹簧断裂时气门落入气缸内?
答案:
<查看本题扣1积分>
查看答案
答案不对?请尝试站内搜索
推荐知识点:
《素问·四气调神大论》指出,秋三月,此谓()
越库配送包括任何一种避免在将货物送去零售商之前将其放入仓库的运输方法。()
耳穴在耳郭的分布有一定的规律,其中与上肢相应的穴位在()
湖心岛旅游风景区位于广州哪里?
Trying to Find a Partner One of the most striking findings of a recent poll in the UK is that of the people interviewed, one in two believes that it is becoming more difficult to meet someone to start a family with. Why are many finding it increasingly difficult to start and sustain intimate relationships? Does modern life really make it harder to fall in love? Or are we making it harder for ourselves? It is certainly the case today that contemporary couples benefit in different ways from relationships. Women no longer rely upon partners for economic security or status. A man doesn't expect his spouse to be in sole charge of running his household and raising his children. But perhaps the knowledge that we can live perfectly well without a partnership means that it takes much more to persuade people to abandon their independence. In theory, finding a partner should be much simpler these days. Only a few generations ago, your choice of soulmate (心上人) was constrained by geography, social convention and family tradition. Although it was never explicit, many marriages were essentially arranged. Now those barriers have been broken down. You can approach a builder or a brain surgeon in any bar in any city on any given evening. When the world is your oyster (牡蛎) ,you surely have a better chance of finding a pearl. But it seems that the old conventions have been replaced by an even tighter constraint: the tyranny of choice. The expectations of partners are inflated to an unmanageable degree: good looks, impressive salary, kind to grandmother, and right socks. There is no room for error in the first impression. We think that a relationship can be perfect. If it isn't, it is disposable. We work to protect ourselves against future heartache and don't put in the hard emotional labor needed to build a strong relationship. Of course, this is complicated by realities. The cost of housing and child-rearing creates pressure to have a stable income and career before a life partnership. Which of the following was NOT a constraint on one's choice of soulmate in the old days?()
用测边交会法观测水平位移,交会点上所夹的角不宜大于105°或小于30°。
中医护理病历的书写要求不正确的是 A.病历完成时间由护理人员所在医院决定 B.望、闻、问、切四诊全面、准确 C.结合西医诊断 D.用钢笔填写,不得涂改,记录后签署本人全名 E.正确分析患者病情、辨证施护
慢性脱屑性唇炎的鉴别诊断不包括()
在职专业技术人员获准自费出国留学的从出境的下一个月起停发工资,保留公职二年。