试题与答案

在纯电容电路中,电压与电流的关系是:()A、纯电容电路的电压与电流频率相同; B、电

题型:多项选择题

题目:

在纯电容电路中,电压与电流的关系是:()

A、纯电容电路的电压与电流频率相同;

B、电流的相位滞后于外加电压u为π/2(即90°);

C、电流的相位超前于外加电压u为π/2(即90°);

D、电压与电流有效值的关系也具有欧姆定律的形式。

答案:

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参考答案:错解析: 深圳企业进口大型成套设备,进口单位应提前到深圳局机电处备案,签订协议书,由机电处组织协调各口岸局及相关部门联合工作,确保进口大型成套设备严格按计划和规程进行检验监管。

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课文背诵

People have been  1 cycling in Amsterdam for years. It is a good city for cycling because it is flat and therefore is convenient for bikes. There are also plenty of places for bicycle parking and most streets in the city centre have a bicycle path. Today some people cal the “City of Bicycles” because of   2  there.

In the 1960s, a group of cycling fans had an idea. They believed that it would be better for everybody if cars weren’t allowed in the city centre and only bicycles were.

They were hopeful that this would help to save energy,   3  and  4 . The group  5 and placed them in lots of neighborhoods around Amsterdam for people to use. Anyone was allowed to take them and use them for short journeys. Wherever someone finished a journey they would leave the bike there for someone else to use. The problem was that it didn’t work-thieves took all the bicycles within weeks!

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