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当前学科：金属非金属矿山安全作业
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混合式通风是指一个掘进工作面装二套局部通风设备，一套作压入式通风，另一套作抽出式通风的联合通风方式。
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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 But it seems that the old conventions have been replaced by an even tighter constraint： the tyranny of choice.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？（）
熔焊时，被熔化的母材在焊道金属中所占的百分比称为（）。
女，12岁，被汽车撞倒，右膝剧痛。体格检查：浮髌试验（+），X线片正常，侧方应力下X线片示膝关节内侧间隙张开达3cm，对这种损伤的处理是（）。
由于停低压电，造成气压机润滑油泵全停，应立即启用（）。
男性，30岁。工作中被高压电击伤头部，致颅骨及头皮5cm×5cm大小缺损。根据患者情况，局部伤情发生可能性最小的是（）
电压互感器二次侧出口（）不装熔断器。
据《茶经》，茶之笋者，长（）
用隔离开关进行经试验许可的拉开母线环流或T接短线操作时，（）远方操作。
汽轮机润滑油泵低油压试验的目的是什么？