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当前学科：电梯维修
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补偿装置是用作补偿曳引轮两边曳引绳自重相差过大的装置.（）
A . 正确
B . 错误
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（）办案适用于重大、复杂的案件或是跨部门管辖交叉的案件。
真空泵如何倒泵？
下肢静脉曲张最常见的并发症是（）
自然灾害中种类最多的是()。
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 （）
雷诺现象的皮肤颜色变化顺序为()
根据矿物颜色产生的原因可分为自色、（）和（）。
男，45岁，颈部渐进性增大包块，CT增强扫描如图所示，最可能的诊断是（）。
招标方式中，邀请招标与公开招标比较，其缺点主要有（）。
患儿男，11岁，因“活动后心悸、气短1个月”来诊。查体：双肺底可闻及湿性啰音；肝、脾肋下未触及；双下肢压凹性水肿明显。胸部X线片：心胸比0.66。超声心动图：左心室舒张末径61mm，左心室射血分数39%。该患者双肺湿性啰音产生的原因是（）