1.单选题- (共5题)
| A．保持U1及P的位置不变，K由a合向b时，I1将增大 |
| B．保持P的位置及U1不变，K由a向b时，R消耗的功率减小 |
| C．保持U1不变，K合在a处，使P上滑，I1将增大 |
| D．保持P的位置不变，K合在a处，若U1增大，I1将减小 |
| A．a为电压表，b为电流表，线路输送电功率是2.2×106W |
| B．a为电流表，b为电压表，线路输送电功率是2200W |
| C．a为电流表，b为电压表，线路输送电功率是2.2×106W |
| D．a为电压表，b为电流表，线路输送电功率是2200W |
的电阻两端，下列说法中正确的是( )。
| A．该电阻消耗的功率为1100 W |
B．该交流电压的瞬时值表达式为u=110 sin(100 t)V |
| C．并联在该电阻两端的交流电压表的示数为110V |
| D．流过电阻的电流方向每秒改变50次 |
A.3mA B.与负载R的值有关 C.0 D .48mA
A． ； | B． ； |
C． | D． |
2.选择题- (共5题)
最近, 学生会调查了一些学生看电视的习惯, 调查结果见下表。请根据表格提示, 写一份调查报告,同时谈论你自己的看电视的习惯。
要求：1. 短文要包括所有要点。 2. 100词左右, 开头已给出, 不计入总词数
姓名 | 节目 | 理由 | 时间 | |
Sam | 喜爱 | 体育节目 | 包含各种体育项目 有一些著名运动员的访谈 | 每周不足 两小时 |
不喜欢 | 连续剧 | 太长, 广告太多, 浪费时间 | ||
Anita | 喜爱 | 纪录片 | 从中了解很多关于自然、历史和真实生活事件 尤其喜欢有关动物的节目 | |
厌恶 | 恐怖电影 | 容易感到恐惧, 不擅长解谜 | ||
Yourself | 喜爱 | … | … | …. |
The Student’s Union has made a survey on the students’ TV viewing habits. Here’s the report.……
根据短文内容和首字母提示, 在下文空格处填入适当的词使短文完整。
Project Hope helps people in the poor area build schools. It also helps poor c{#blank#}1{#/blank#} go to school. China’s Project Hope has raised lots of m{#blank#}2{#/blank#} every year. It has helped more than 2.5 million poor students s{#blank#}3{#/blank#} it was set up over 20 years ago. So far, the project has collected more than 2.2 billion yuan from China and o{#blank#}4{#/blank#} countries in the world. The money has been used in the building of many Project Hope primary schools.
About 80 percent of the Project Hope schools are in China’s middle and w{#blank#}5{#/blank#} areas, because they are still developing.
Project Hope has helped to b{#blank#}6{#/blank#} faraway learning centers, libraries and video centers. It also helped train school teachers from poor areas.
Of all the non-government welfare（福利）projects, Project Hope has become the l{#blank#}7{#/blank#}one so far in China. People say that still about 40 million primary school students n{#blank#}8{#/blank#} help around the country, including 34 million primary, junior, and high school students. Mr. Gao, one of the w{#blank#}9{#/blank#} in Project Hope said the organization would t{#blank#}10{#/blank#}to raise more money and help more students in the future.
The police are trying to find out whether he was killed or he killed{#blank#}1{#/blank#}(he).
The police are trying to find out whether he was killed or he killed{#blank#}1{#/blank#}(he).
3.多选题- (共1题)
| A．用电流表测该电流其示数为10A |
| B．该交流电流的频率为100Hz |
| C．该交流电流通过10Ω电阻时，电阻消耗的电功率为2000 W |
D．该交流电流瞬时值表达式为i＝10 sin628t A |
4.填空题- (共3题)
5.解答题- (共3题)
(1)写出交变电流瞬时值表达式；
(2)外电阻上消耗的功率；
(3)从计时开始，线圈转过
过程中，通过外电阻的电荷量是多少?（1）画出输电线路的示意图.（标明各部分的符号）
（2）所用升压和降压变压器的原、副线圈的匝数比各为多少？（使用的变压器是理想变压器）
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【1】题量占比
单选题:(5道)
选择题:(5道)
多选题:(1道)
填空题:(3道)
解答题:(3道)
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【2】：难度分析
1星难题：0
2星难题：0
3星难题：0
4星难题：0
5星难题：0
6星难题：11
7星难题：0
8星难题：1
9星难题：0