电流强度是在电场作用下，单位时间内通过导体截面的电量。 发布时间：2017-07-19 19:55 │ 来源：www.tikuol.com 题型：判断题 问题： 电流强度是在电场作用下，单位时间内通过导体截面的电量。
题型：判断题 Reading comprehension. The sun is the largest source of light. We know that life on the earth depends on the heat of the sun. Butthe light of the sun is as necessary to life as its heat. Another important source of light is produced by electric sparks in tubes which has special gases. That is known as indirect light. The light we see directly from the source of light, such as sun, is known as direct light. Laser (激光) is a new kind of light source. It possesses a series of remarkable properties, which makes ita better light source in a number of cases. 1. Which is true in the following?[ ]Ａ: The light made by electric sparks in tubes with special gases is called direct light. Ｂ: Sunlight is colourless. Ｃ: Indirect light is sent from the power station and so on. Ｄ: Human beings as well as all animals depend on direct light. 2. Which is false in the following? [ ]Ａ: Sunlight is a kind of direct light. Ｂ: For man sunlight is a much more useful light than any other light. Ｃ: Electric light is more remarkable than laser in research. Ｄ: Actually moonlight comes from the sun. 3. Life on the earth can't live ____. [ ]Ａ: with sunlight Ｂ: without sunlight Ｃ: with moonlight Ｄ: without moonlight 4. Laser, as you know, ____. [ ]Ａ: has not been widely used. Ｂ: has not been researched Ｃ: is still unknown Ｄ: is less useful than any other light 5. The word "source" means ____. [ ]Ａ: 源 Ｂ: 系 Ｃ: 种 Ｄ: 类 查看答案
题型：判断题 青少年社会工作者在为对象服务时，探索建立学校、家庭、社区良性互动的青少年社会工作模式，还提供青少年父母亲职教育机会，提高父母教导青少年的技巧这些工作属于()的青少年社会工作。A.预防性B.教育性C.发展性D.支持性 查看答案
题型：判断题 老年男性，进行性黄疸2个月伴中上腹持续性疼痛，夜间平卧时明显，消瘦，查体：慢性消耗性病容，皮肤巩膜黄染，腹平坦。脐上偏右深压痛，Courvoisier征阳性，未及异常包块，该患者诊断首先考虑A．慢性胆囊炎B．胆道结石C．原发性肝癌D．胰头癌E．胃癌 查看答案
题型：判断题 资产的β系数是衡量风险大小的重要指标，下列表述错误的是( )。A．β越大，说明该资产的风险越大B．某资产的β＝0，说明此资产无风险C．某资产的β＝1，说明该资产的系统风险等于整个市场组合的平均风险D．某资产的β大于“说明该资产的市场风险大于股票市场的平均风险 查看答案