-
题目： 问答题
计算题：求如图D-19所示三角波的拉氏变换。
｛提示：三角波的波形表达式为
答案不对？请尝试站内搜索
推荐知识点:
- 成年男子的平均摆脱电流为比成年女子的平均摆脱电流（）。
- 如下哪一项不是《广东移动直放站覆盖设备统一监控系统监控中心功能规范（版本：V2.0）》中定义的告警级别（）。
- 企业、事业单位召开讨论有关工资、福利、劳动安全卫生、社会保险等涉及职工切身利益的会议，（）有工会代表参加。
- 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 （）”.
- （2008）Internet网使用的协议是：（）
- 公安机关逮捕犯罪嫌疑人的时候，遇紧急情况可以不出示《逮捕证》。
- 在多品种条件下，能够影响加权平均边际贡献率大小的因素有（）
- 下列关于高血压脑出血的发病机制的叙述中，不正确的是（）
- 发售伤残军人票时有何规定？
- 患儿，女，5岁，有鼻塞、流清鼻涕，偶有打喷嚏，伴耳闷、张嘴呼吸半年。鼻镜检查见：鼻黏膜苍白水肿，鼻道有较多的清水样分泌物此病的首选治疗措施（）