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危险化学品的标志使用原则：当一种危险化学品具有一种以上的危险性时，应该用主标志表示主要危险性类别，并用副标志表示重要的其他的危险类别。
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（）是音乐艺术的实践过程。
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下列案件中，人民法院可以直接受理的有()。
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项雌激素与子宫内膜癌关系的配对病例对照研究，共63对。病例组与对照组两组均有雌激素暴露史者27对，两组均无暴露史者4对，暴露组有暴露史而对照组无暴露史者29对，其余为对照组有暴露而病例组无暴露者。OR为（）
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交流伺服电动机在控制绕组电流作用下转动起来，如果控制绕组突然断路，则转制不会自行停转
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以下哪项的病变产生双侧对称的节段性分离性感觉障碍，痛温觉减弱或消失，触觉保留（）。
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下述论述中不正确的是()。
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卫生监督的功能有（）
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建筑的主要特点（），即内部结构的空间性。
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Questions 26 to 30 are based on the following passage. Exercise is one of the few factors with a positive role in long-term maintenance of body weight. Unfortunately, that message has not gotten through to the average American, who would rather try switching to “light” beer and low-calorie bread than increase physical exertion. The Centers for Disease Control, for example, found that fewer than one-fourth of overweight adults who were trying to shed pounds said they were combining exercise with their diet. In rejecting exercise, some people may be discouraged too much by caloric-expenditure charts: for example, one would have to briskly walk three miles just to work off the 275 calories in one delicious Danish pastry (小甜饼). Even exercise professionals concede half a point here. “Exercise by itself is a very tough way to lose weight,” says York Onnen, program director of the President’s Council on Physical Fitness and Sports. Still, exercise’s supporting role in weight reduction is vital. A study at the Boston University Medical Center of overweight police officers and other public employees confirmed that those who dieted without exercise regained almost all their old weight, while those who worked exercise into their daily routine maintained their new weight. If you have been sedentary (极少活动的) and decide to start walking one mile a day, the added exercise could burn an extra 100 calories daily. In a year’s time, assuming no increase in food intake, you could lose ten pounds. By increasing the distance of your walks gradually and making other dietary adjustments, you may lose even more weight. Some people dislike exercise because （）