4月6日（周一）学习任务： 1、视频学习“任务12.1 网站首页设计” https://www.icourse163.org/learn/SZIT-1449307162？tid=1449727443#/learn/content？type=detail&id=1213691114&sm=1 2、提交作业提交视频教程中实例练习。

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更多“4月6日（周一）学习任务： 1、视频学习“任务12.1 网…”相关的问题

第1题

3dB不变阻微带双分支定向耦合器如图所示。已知U_i1=|U_i1|e¹⁰，U_i4=|U_i4|e^jπ/2，试证明端口(2)输出电压U_r2正比于|U_i1|+|U_i4|，端口(3)输出电压U_r3正比于|U_i1|-|U_i4|。当|U_i1|=2|U_i4|时，画出U_i1、U_i4及U_r2、U_r3的矢量图。

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第2题

如图6.4.5所示电路中R=100Ω，ωL=1/ωC=200Ω，u(t)=[20+200sinωt+68.5·sin(2ωt+30°)]V，试求u_ab(t)和u_R(t)。

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第3题

S4.(Lines 3-4, Para. 1, Passage 4)

Social support consists of the exchange of resources among people based on their inter personal ties.

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第4题

ThedatabaseinstanceiscurrentlyusingSPFILE.View&e

ThedatabaseinstanceiscurrentlyusingSPFILE.ViewtheExhibitandexaminetheerrorthatyoureceivedwhilerunningtheDBStructureIntegritycheck.Givenbelowarethestepstorecoverfromtheerrorinrandomorder：

1.Shutdowntheinstance，ifnotalreadydone.

2.Copyoneoftheremainingcontrolfilestoanewlocation.

3.ChangethevalueoftheCONTROL_FILESinitializationparametertocorrespondtothenewlocationofthecontrolfiles.

4.StartupthedatabaseinstancetotheNOMOUNTstage.

5.Recoverthedatabasetothepointoffailureofthecontrolfile.

6.Openthedatabase.

Identifythecorrectsequenceofsteps（）

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第5题

The air surrounding us is important to everyone. Without air, we could not （1） Everyone understands that. But air is necessary（2）many other ways that are not always so obvious or widely known. For example, if we did not have air, （3） would be no sound. Sound travels through air. Where there is no air, there is no sound. （4）air, there would be no fire. There would be no automobiles, （5） motors need air in order to operate. Without air there would be no wind or clouds. There would be no （6）, as we know it. The night time would be very（7）, the days very hot. We would be forced to seek shelter from the sun, （8）there would be no atmosphere to protect us from the sun’s deadly rays. The atmosphere is all the air surrounding the （9） . Atmosphere pressure is the weight of all that air against the （10）of the earth. If we did not have atmospheric pressure, we could not have automobile tires. The tires would swell or burst if they did not have the pressure of the atmosphere against their surface.

1、 A. living B. lively C. exist D. alive

2、 A. under B. of C. on D. in

3、 A. there B. they C. it D. we

4、 A. Despite B. With C. As D. Without

5、 A. however B. but C. since D. and

6、 A. air B. weather C. breeze D. climate

7、 A. warm B. cool C. cold D. hot

8、 A. as B. so C. that D. so that

9、 A. floor B. ground C. land D. earth

10、 A. top B. surface C. face D. coverage

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