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直线制组织结构的优点有( )。A．能保证指挥命令统一、决策迅速并且容易贯彻到底B．每一级单元的责任、权限非常明确C．能确保组织纪律严明、组织秩序规整D．结构简单，运作费用较低E．便于交叉管理
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蛋鸡饲养方式中以（）养为好。
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在混凝土的组成中，骨料一般占总体积的（）。
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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 （）
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射频识别技术开始兴起是在（）
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简述总传热系数的概念，它包含哪些因素？
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对于拆卸时损坏或失去弹性的密封垫必须修复。
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有机化学试剂按用途分为两类：分析试剂和（）试剂。
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四行程汽油机与四行程柴油机的重大区别是（）。
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如果发射机使用天线作为MIMO方案的一部分，这些规范指的是所有天线总的（）。