使用发电机、空压机、搅拌机等机电设备时，应有良好的（）装置；使用电动锯轨机、电动打磨

如图1所示，一端封闭的两条平行光滑长导轨相距L，距左端L处的右侧一段被弯成半径为的四分之一圆弧，圆弧导轨的左、右两段处于高度相差的水平面上。以弧形导轨的末端点O为坐标原点，水平向右为x轴正方向，建立Ox坐标轴。圆弧导轨所在区域无磁场；左段区域存在空间上均匀分布，但随时间t均匀变化的磁场B(t)，如图2所示；右段区域存在磁感应强度大小不随时间变化，只沿x方向均匀变化的磁场B(x)，如图3所示；磁场B(t)和B(x)的方向均竖直向上。在圆弧导轨最上端，放置一质量为m的金属棒ab，与导轨左段形成闭合回路，金属棒由静止开始下滑时左段磁场B(t)开始变化，金属棒与导轨始终接触良好，经过时间t₀金属棒恰好滑到圆弧导轨底端。已知金属棒在回路中的电阻为R，导轨电阻不计，重力加速度为g。

（1）求金属棒在圆弧轨道上滑动过程中，回路中产生的感应电动势E；

（2）如果根据已知条件，金属棒能离开右段磁场B(x)区域，离开时的速度为v，求金属棒从开始滑动到离开右段磁场过程中产生的焦耳热Q；

（3）如果根据已知条件，金属棒滑行到x=x₁位置时停下来，

a. 求金属棒在水平轨道上滑动过程中通过导体棒的电荷量q；

b. 通过计算，确定金属棒在全部运动过程中感应电流最大时的位置。

     Time:April 8th,2010 at 10 PM To April 9th,2010 at 3 AM

     Location:Babyface Guangzhou

     Street:No.83 Changdi Da Ma Road, Guangzhou.

     City/Town:Guangzhou

     Website or Map:http://www, babyface.com.cn

     Phone:020-8335 5771

     Organized By:Babyface China Official

     Grammy nominated (格莱美奖提名) artist and globally admired DJ and Producer Paul van Dyk

continues to lead the electronic music charts and appears at the highpoint of every Top DJ list across the

globe.PvD, as his fans have nicknamed him, is currently ranked the World's No.1 DJ by DJ Magazine's

"Top 100 DJs poll" for the second successive year.

     PvD is wellknown as one of the hardest working artists, with soldout tours that cross each continent,

headline spots at every major festival, and a hugely successful recording career.With over 3 million albums sold worldwide, van Dyk travels around the world over 16 times each year to sold out performances

internationally.

     Born in Eisenhuettenstadt, East Germany, Paul van Dyk grew up in East Berlin.Because his community did not have a true club culture, Paul van Dyk listened to the radio where he discovered his passion for

music that extended beyond Techno music-he wanted to create a different, more unique sound.In the early 1990's Paul van Dyk was performing regularly at various clubs in Berlin before releasing his first album

45 RPM in 1994.But it was the release of his second album Seven Ways that put him into Top 100,

followed by the release of his hit single "For An Angel, " which began to earn him praise across the globe.By the time Paul van Dyk released Out There & Back in 2000, it became clear that the Berlinbased

musician had far more to offer than his signature club sets that had already defined him as one of the most

influential DJs and producers of all time.His first mix CD Politics of Dancing was released in 2001,

followed by Global in 2003-a DVD which illustrates his own experiences traveling the world.

1. What activity does this passage introduce to us?

A. Paul van Dyk Volume World Tour at Babyface Guangzhou.

B. Grammy Prize Ceremony at Babyface Guangzhou.

C. Release of PvD's original album Reflections.

D. The foundation of Babyface China Official.

2. Which album first made PvD into the Top 100?

A. For An Angel  

B. Seven Ways

C. 45 RPM  

D. Out There & Back

3. According to the passage PvD can be best described as________.

A. intelligent but proud

B. hardworking but absentminded

C. optimistic and outgoing

D. creative and potential

4. PvD's passion for music originated from________.

A. performing at various clubs  

B. listening to the radio

C. his tours across the globe  

D. his true club culture

5. According to the passage, PvD________.

A. is ranked the world's No.1 DJ in Top 100 DJs Poll for life

B. shows us his travelling experience in Global

C. sings about politics in his mix CD Politics of Dancing

D. received Grammy Prizes several times

下列哪个不属于《水浒传》作为“快书”的三个层次之一？（）

A、个人报仇雪恨之快

B、行侠仗义、勇于助人之快

C、团结奋进之快

D、打破束缚，开创新天地之快

WAP页面设置：用户通过手机登录（），点击“参数设置”，进入页面后再点击“修改密码”，即可设置新的密码。

银行授权卡（柜员卡）、印鉴密押、空白凭证、金库尾箱、查询对账、重要岗位是案件多发的“六个关健环节”。（）