理想变压器原线圈接在如图所示的电压上,原副线圈匝数之比为10:1,串在原线圈上的

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问题:

理想变压器原线圈接在如图所示的电压上,原副线圈匝数之比为10:1,串在原线圈上的电流表的示数为1A,则以下叙述正确的是(  )

A.变压器输出功率为200W

B.若n1=100匝,则输出端线圈的磁通量变化率的最大值为2Wb/s

C.副线圈两端的电压表示数20V

D.变压器的输入功率是由发电厂的输出功率决定的

考点:变压器的结构和原理
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()可用于描述数据流图中数据存储及其之间的关系,最初用于数据库概念设计。在某学生选课系统中使用该工具来描述,学生的学号属于()。

()可用于描述数据流图中数据存储及其之间的关系,最初用于数据库概念设计。

A.实体关系图

B.数据字典

C.IPO 图

D.判定表

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"Culture shock" occurs as a result of total immersion in new culture. It (51) to "people who have been suddenly transplanted abroad. " Newcomers may be anxious (52) they do not speak the language, know the (53) , or understand people’s behavior in daily life. The visitor finds that "yes" may not always mean "yes", that friendliness does not (54) mean friendship or that statements that appear to be serious are really intended (55) jokes. The foreigner may be unsure as to when to shake hands or embrace, when to (56) conversations, or how to approach a stranger. The (57) of "culture shock" helps explain feelings of bewilderment and disorientation. Language problems do not account for all the frustrations that people feel. When one is (58) of everything that was once familiar, such as understanding a transportation system, knowing how to register for university classes, (59) knowing how to make friends, difficulties in coping with the new society may (60) .

A.like

B.for

C.by

D.as

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竣工决算的的内容不包括()。

A、竣工结算掘袁

B、竣工结算书

C、竣工决算报告说明书

D、工程造价比较分析

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在道路货物运输组织中,______组织方式体现了平行作业的基本原理。

A.双班运输
B.拖挂运输
C.甩挂运输
D.定时运输

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煤焦油可分为低温焦油和高温焦油,冶金厂一般处理的是()焦油。

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