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某城镇需集中式供水的人口达40万人，为了确保其饮用水卫生安全，保障人体健康，根据《生活饮用水卫生监督管理办法》要求。 该城镇供水的管网水采样点个数及水质监测时采样点的设置应为
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某化工厂1162名工人的体检结果见表1，下列说法中正确的是 表1 某化工厂慢性气管炎患病与专业工龄的关系() 工龄(年) 检查人数 患者数 体检人数构成比(%) 患者构成比(%) 患病率(%) 1～ 340 17 29.26 11.56 5.00 5～ 254 30 21.86 20.41 11.81 10～ 432 73 37.18 49.66 16.90 15～ 136 27 11.70 18.37 19.85 合计 1162 147 100.00 100.00 12.65
Accidents was caused; they don’t just happen. The reason may be easy to see: a shelf out of reach, a patch of ice on the road, an overloaded truck. But merely often than not there is a chain of events leading up to the misfortune—frustration, tiredness or just bad temper—that show what the accident really is, a sort of attack on oneself.Road accidents, for example, happen frequently after a family quarrel, and we all know people who are accidents-prone, so often at odds with themselves and the world that they seem to cause accidents for themselves and others.By definition, an accident is something you can not predict or avoid, and the idea which used to be current, that the majority of road accidents are caused by a minority of criminally careless drivers, is not supported by insurance statistics. These show that most accidents involve ordinary motorists in a moment of carelessness or thoughtlessness.It is not always clear, either, what sort of conditions makes people more likely to have an accident. For instance, the law requires all factories to take safety precautions and most companies have safety committees to make sure the regulations are observed, but still, every day in Britain, some fifty thousand men and women are injured from work due to accidents. These accidents are largely the result of human error or misjudgment—noise and fatigue, boredom or worry are possible factors which contribute to this. Doctors who work in factories have found that those who drink too much, usually people who have a high anxiety level, run three times the normal risk of accidents at work. The following are the factors of accidents EXCEPT（）
Most stars are ( visible )（）to the naked eye in the day - time.
The headmaster（）us that the school would be closed for one day next week.
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