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为了减小门极损耗，晶闸管正常导通的方法是阳极加正向电压，门极加（）
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“事皆决于法”是（）朝的立法指导思想之一。
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回答题Human needs seem endless．They might be regarded as making up several levels．When there is enough money to satisfy one level of needs, another level appears．The first and most basic level of needs involves food．Once this level is satisfied, the second level of needs, clothing and some sort of shelter, appears．By the end of World War Ⅱ , these needs were satisfied for a great majority of Americans．Then a third level appeared．It included such items as automobiles and new houses．By 1957 or 1958 this third level of needs was fairly well satisfied．Then, in the late 1950s, a fourth level of needs appeared: the "life-enriching level．While the other levels involve physical satisfaction, that is, the feeding, comfort, safety, and transportation, this level stresses mental needs for recognition, achievement, and happiness．It includes a variety of goods and services．Among them are vacation trips, the best medical and dental care, and recreation．Also included here are fancy goods and the latest styles in clothing．On the fourth level, a lot of money is spent on services, while on the first three levels more isspent on goods．A fifth level would probably involve needs that can be achieved best by community action．Consumers may be spending more on taxes to pay for government action against disease, ignorance, crime, and prejudice．After filling our stomachs, our clothes closets, our garages, our teeth, and our minds, we now may seek to ensure the health, safety, and leisure to enjoy more fully the good things on the first four levels．According to the passage, man will begin to think about such needs as housing and clothing only when________
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在有自然发火危险的矿井，必须定期检查（）浓度、气体温度的变化情况
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促进铸铁材料石墨化的元素（即铸铁中的有益元素）是（ ）。 A.P B.Si C.Mn D.S
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储量损失按损失的形态分类，可分为：（）
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下列栓剂基质中，属于亲水性基质的是（）。
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ALS与脊髓型颈椎病鉴别，最有意义的是（）
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行政责任的特点包括（）。
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烧伤的Ⅲ度四分法是（）度、（）度、（）度、（）度。