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凸极式同步电动机是由()组成。
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在正投影图的展开图中,A点的水平投影a和正面投影a′的连接线必定()于相应的投影轴。
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支点在力点与阻力点中间的杠杆模式()
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农村集体经济审计意见书的内容包括()。
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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. “Even exercise professionals concede half a point here” (Line 3, Para. 2) means “They ()”.
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买主市场是供不应求的市场。
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如何用微量液体进样器进样?
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充氮气气调储藏的原理是()。
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J2011-02触屏指纹锁的激活方式有()
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有一患者长时间步行引起第2跖骨骨折,问病因是何种外力?()