单选题
Which of the following statements represents the main difference between a relay and a contactor?（）
发布日期：2021-03-22
Contactors control current and relays control voltage
A relay is series connected and a contactor is parallel connected
Contactors can handle heavier loads than relays
Contactors are made from silver and relays are made from copper
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Literacy Volunteer Last summer I went through a training program and became a literacy volunteer （扫盲志愿者）. The training I received， though excellent， did not tell me how it was to work with a real student， however. When I began to discover what other people's lives were like because they could not read， I realized the true importance of reading. My first student Jane was a 44-year-old single mother of three. In the first lesson， I found out she walked two miles to the nearest supermarket twice a week because she didn't know which bus to take. When I told her I would get her a bus schedule， she told me it would not help because she could not read it. She said she also had difficulty once she got to the supermarket because she couldn't always remember what she needed. Since she did not know words， she could not write out a shopping list. Also， she could only recognize items by their labels. As a result， if the product had a different label， she would not recognize it as the product she wanted. As we worked together， learning how to read built Jane's self-confidence， which encouraged her to continue in her studies. She began to make rapid progress and was even able to take the bus to the supermarket. After this successful trip， she reported how self-confident she felt. At the end of the program， she began helping her youngest son， Tony， a shy first grader， with his reading. She sat with him before he went to sleep and together they would read bedtime stories. When his eyes became wide with excitement as she read pride was written all over her face， and she began to see how her own hard work in learning to read paid off. As she described this experience， I was proud of myself， too. I found that helping Jane to build her self-confidence was more rewarding than anything I had ever done before. As a literacy volunteer， I learned a great deal about teaching and helping others. In fact， I may have learned more from the experience than Jane did. After her successful trip to the supermarket，Jane reported how self-confident she felt.（）
车站每侧站台设有2个紧急停车按钮。一旦检测到紧急停车按钮被按下，立即关闭该站台，禁止列车进入车站或进入区间。
顺序分配法，也称为梯形分配法。特点就是按照辅助生产车间受益多少的顺序分配费用，受益少的先分配，受益多的后分配。此种方法适用于（）的企业。
粘性土的界限含水量是土体的固有指标，与环境变化无关。
RIA的基本反应原理是（）
下列各项中，不属于类风湿关节炎的关节外表现的是（）。
当前气象预报已广泛采用数值预报方法，这种预报方法会涉及计算机应用中的（）。
简述影响消费倾向的客观因素。
李某回国携带应申报的物品进境，未向海关如实申报，海关认定李某的行为构成走私，对其作出没收物品，并罚款1000元的处罚。按照《行政处罚法》的规定，海关的上述处罚（）
简要说明《雨巷》在追求意境的朦胧上有哪些特点。
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