为了节约用电,小强利用两个单刀双掷开关设计了一个改进地下通道照明电路的方案:每晚

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问题:

为了节约用电,小强利用两个单刀双掷开关设计了一个改进地下通道照明电路的方案:每晚7:00至11:00将两盏灯并联后接在电源上,每晚11:00至次日早6:00将两盏灯串联后接在同一电源上.请将图中的电路补充完整,使两个单刀双掷开关同时接左侧或同时接右侧时,实现上述两种连接方式的切换.

考点:电路的连接
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第二节短文改错(共10小题,每小题1.5分,满分15分)

For different reasons, people are pouring into big cities, which cause much more trouble than expected. As the growth of the population, city problems are grown day by day. To begin with, big cities are becoming so crowed that it makes find jobs very difficult. As a result, people without jobs are likely to become danger to our society. In additional, the environment is getting worse and worse, and there is pollution and traffic problems as well as. We can’t choose but face with them. In my opinion, big cities need to control the population to help develop itself for the future. In terms of improving the environment, every citizen should be called on to contribute to protect the environment.

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如何处理磨机尾部出现很大颗粒?

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不属于甲亢危象表现的是

A.病情突然恶化
B.高热脱水
C.心力衰竭
D.重度感染
E.恶性突眼

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()是win2000中提供的Internet信息服务组件。

A、Web

B、SQL

C、PWS

D、IIS

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分散/活性染料同浆印花,主要用于涤棉混纺织物的中、深色印花,对分散染料和活性染料无特殊要求。

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