作图题. (1)把带有开关的电灯、三孔插座正确地连入图1的家庭电路中. (2)用

题型:问答题

问题:

作图题.

(1)把带有开关的电灯、三孔插座正确地连入图1的家庭电路中.

(2)用笔线代替导线把图2中的元件连接起来,要求L1与L2串联,电压表V测L1的电压,并画出对应的电路图.

考点:家庭电路的连接电路的连接电路图及元件符号
题型:问答题

读短文,判断正(T)误(F)。

     When people go to England, they must learn something about transportation there.

     In England, cars, buses and bikes must keep to the left side of the street. If a person wishes

 to cross a street, he must stop and either look at the traffic lights or look both ways down the

street. And instead of looking left first, as we do in China, they look right first.

     To get about in London, visitors should learn to use buses and the underground. First of all

they must know which direction (方向) they are going in and which bus and underground train

they must take. At the bus stop they wait for buses to come. As soon as they get on the bus, they

must pay for their tickets.

( )1. In England, people go along the left side of the road as we do in China.      

( )2. When they want to cross a street, people in England look right first.          

( )3. To go about in London, visitors should learn to drive.                        

( )4. First of all, visitors must know where to go.                                  

( )5. After people get on a bus, they don’t have to pay for their tickets at once.  

题型:问答题

正多边形的一个中心角为36度,那么这个正多边形的一个内角等于______度.

题型:问答题

在机械制图中,对文字有哪些要求?

题型:问答题

2013年户籍城镇化率达到36%,根据《国家新型城镇化规划(2014-2020年)》预测,2020年户籍城镇化率将达到45%。现在,按照常住人口计算,我国城镇化率已接近()。

A、36%

B、40%

C、45%

D、55%

题型:问答题

克隆羊“多利”的问世引起了许多人对“治疗性克隆”的兴趣。下图所示为人类“治疗性克隆”的大概过程,请据图作答:

如果进行生殖性克隆,则不需要进行定向诱导,但必须进行(),使得胚胎能正常发育成完整个体,该操作一般在()时期进行。

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