问题 选择题
如图所示,处在磁感应强度为B的匀强磁场中的单匝矩线圈abcd,以恒定的角速度ω绕ab边转动,磁场方向垂直于纸面向里,线圈所围面积为S,线圈导线的总电阻为R.t=0时刻线圈平面与纸面重合,且cd边正在离开纸面向外运动.则正确的是(  )

A.时刻t线圈中电流的瞬时值icosωt

B.线圈中电流的有效值I

C.线圈中电流的有效值I=

D.线圈消耗的电功率P

答案

答案:C

完形填空

Heading off to college this year?   小题1:   

1. Dress to impress.

Stylist and business consultant Daniela Smith says, "Girls should keep in mind that your college professors will often be the bridge that connects you to your future career and your classmates will become your professional network. You don't need to dress like you're going to the office, but you should display an ability to properly present yourself with appropriate maturity and confidence, and look put-together."

2. Logo mania(品牌热症).

Wearing the logos of brands aimed at younger customers physically identifies you as part of that age group, so consider the targeted age group of the stores you shop at.  小题2:     But consider this: college is a time of self-discovery, a chance to develop your own personal style.Instead of wearing logos head to toe, "walking advertisement"-style, why not express who you really are?

3. Wear real pants.

  小题3:    Smith points out that leggings, yoga pants, and sweatpants are entirely unacceptable in public unless you're exercising. Although leggings worn as pants are a common trend among high school and college girls, they are not an appropriate choice for daywear.   小题4:     So, get rid of leggings and wear real pants!

4.   小题5:.

Stay away from sweaters and T-shirts with smiling animals, cartoon characters, or Hello Kitty on them.Sure, kittens might be cute, but they're not doing you any favors in the style department.Dressing too cutesy can take years off your look, and not necessarily in a good way!

A.The combination of leggings and baggy shirts is all too common on college campuses.

B.Keep the cute factor to a minimum.

C.And every college student prefers to wear real pants.

D.It's tempting to load up on logos, especially well-known logos that signify high-end brands.E. Here are some fashion tips from our experts you should keep in mind.

F. As a young woman, your style choice should begin to reflect your maturity level.

G. Wearing the logos of brands means that the young customers have the chance to develop their personal character.

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