如图所示,理想变压器原副线圈匝数之比为4:1,原线圈接入一电压为u=220sin

题型:多选题

问题:

如图所示,理想变压器原副线圈匝数之比为4:1,原线圈接入一电压为u=220sin100πtV的交流电源,副线圈接一个R=27.5Ω的负载电阻.则下述结论正确的是(  )

A.副线圈中电压表的读数为55V

B.副线圈中输出交流电的周期为0.01s

C.原线圈中电流表的读数为0.5A

D.原线圈中的输入功率为110W

考点:变压器的结构和原理
题型:多选题
下面短文中有10处语言错误。请在有错误的地方增加、删除或修改某个单词。
增加:在缺词处加一个漏字符号(∧),并在其下面写上该加的词。
删除:把多余的词用斜线(\)划掉。
修改:在错的词下划一横线,并在该词下面写上修改后的词。
注意:1.每处错误及其修改均仅限一词;
2.只允许修改l0处,多者(从第ll处起)不计分。
例如:
It was very nice to get your invitation to spend ∧ weekend with you. Luckily
the
I was completely free then, so I'll say "yes". I'll arrive in Bristol at around 8 p. m. 
am
in Friday evening.
on
 
Last weekend we went mountain-climbing. Even the heavy rain in the morning could not prevent us go. Setting off very early, we went along an extreme narrow road, all in high spirits. On every side of the road were green fields and some farm houses. We could hear the sound of the rain and our footsteps mixing with our laughter. At noon we reached the top of the mountain. That surprised us most there was the beauty of the scenes. After having short rest and sharing with the food we had brought, we started going down. It had rained even harder. We were wet to the skin, and we still sang and laughed happily. 
题型:多选题

常温下,向某浓度的硫酸溶液中逐滴滴入某浓度的氢氧化钡溶液,生成沉淀的质量与加入氢氧化钡溶液的体积关系如图所示.a、b、c、d分别表示实验时不同阶段的反应结果,下列说法中正确的是(  )

A.溶液的导电能力:a>b>c>d

B.溶液的pH大小:a>b>c>d

C.a,b溶液呈酸性

D.c,d溶液呈碱性

题型:多选题

因注册验资开立的临时存款账户,其账户名称应为()。

A、组织机构代码注明的名称

B、工商行政管理部门核发的企业名称预先核准通知书上注明的名称

C、客户提供的名称

D、出资人名称

题型:多选题

堆码

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出口信用保险产生的基础是______,是国际贸易发展的客观要求。

A.一国的GDP
B.一国的商品总产量
C.一国的出口贸易
D.一国的进口贸易

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