下图为“探究凸透镜成像规律”的实验装置。 (1)点燃蜡烛后,无论怎么样移动光屏,

题型:实验题

问题:

下图为“探究凸透镜成像规律”的实验装置。

(1)点燃蜡烛后,无论怎么样移动光屏,光屏上总是得不到烛焰的像,这是为什么?写出可能的两种原因。                                                                                                                

(2)为了找到像的准确位置,必须做好光屏的微调,即在一定范围内左右移动光屏,使光屏上的像由模糊到_____________,直至找到像最清晰的位置。

(3)如图,蜡烛恰好在光屏上成倒立、等大、清晰的像,则凸透镜的焦距是_______cm。

(4)保持蜡烛位置不动,把凸透镜从距蜡烛一倍焦距处向蜡烛移动2cm,可以从______________(选填“光屏一侧”或“光屏另一侧”)通过凸透镜观察到烛焰正立、_________的虚像,_________就是利用了这一成像规律。

考点:凸透镜成像的规律
题型:实验题

This is Yoga! (瑜伽) Experience this for yourself.

How do you feel when you leave a yoga class? Do you feel relaxed, full of energy, prepared and ready to face anything and everything? Do you feel better than when you walked in?  If you have answered “No’ to these questions then you are NOT doing yoga.

After walking out of the class, do you feel that you have been pushed through, that theclass was hard,that you have less energy at the end of the class, that you have not got any energy, or that you are still tight and full of stress? If you answered “Yes” to any of these questions, you are NOT doing yoga.

Are you forced (被迫) into positions(姿势) beyond what you can? Do you know why you are doing the actions in the “yoga” class you attend?

Satyananda Yoga Center teaches YOGA. We know and understand yoga and YOU. We teach yoga with this knowledge and understanding.

You are not forced into positions not suitable for you, or too early for you. You will leave Satyananda Yoga Center yoga classes feeing relaxed, free from stress, energized, and ready for whatever life brings to you.

With regular attendance and practice, the quality of your life improves with betterhealth, and stress-free mind.Your family and friends will notice the difference. You will feel the difference forbetter. This is because you are doing yoga.

Yoga for Everyone!

Yoga is a science. You are the scientist, and you are the one in the science of yoga.

New Saturday morning class from September — 8:30 a.m. to 9:30 a.m. at the Asian American Cultural Center, 11713 Jollyville Road, Austin, Texas.

To sign up, call:2669862, or email: keepfitwithyoga@yahoo.com

小题1:At which time can people learn yoga according to this passage?

A.At 10:00 on Sunday in September.

B.At 22:00 on the first Saturday in October.

C.At 9:00 on Saturday in September.

D.On everey Saturday afternoon in September.小题2:The passage suggests but doesn’t tell directly (直接地) that ______________.

A.only Satyananda Yoga Center teaches yoga

B.there’s no better place to learn yoga than Satyananda Yoga Center

C.some yoga centers are not teaching yoga in the right way

D.you have to be a scientist before you take up yoga小题3:Which is NOT true if people follow the right ways to do yoga?

A.In the class you will practise some positions.

B.You will feel very different after practising once.

C.You will feel new and fresh after practising yoga.

D.You will feel great if you keep on practising it for a few months.

题型:实验题

--- Julia hurt her back when she fell, and she is now in hospital.

--- Oh, really? I _____ know. I _____ go and visit her.

A.don’t; would

B.didn’t; will

C.don’t; will

D.didn’t; am going to

题型:实验题

发型美学,简单地讲是研究发型审美的()。

A.艺术

B.课程

C.科学

D.理论

题型:实验题

关于常用关节及特殊结构注射技术,下列说法错误的是()

A.穿刺时,切忌在深部大幅度改变方向或反复穿刺,以免损伤关节

B.注射皮质类固醇时,注射的激素用局麻剂稀释或先注射激素,再注射局麻剂至关节腔稀释

C.当皮质类固醇注射到关节间隙以外或从关节间隙渗漏,将发生注射区的组织萎缩

D.如果注射到关节腔内的皮质类固醇吸收进入体循环,不会导致血糖升高

E.注射之后患者应当有一段关节制动休息期,并且防止进一步操作

题型:实验题

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