题干

关于曲线运动,下列说法正确的是(   )

A:曲线运动一定是变速运动

B:变速运动一定是曲线运动

C:物体在恒力作用下不可能做曲线运动

D:做曲线运动的物体可能受到恒力作用

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答案(点此获取答案解析)

A,D

同类题3

                                                                                  Sea Life Melbourne Aquarium (水族馆)

   The all-new Sea Life Melbourne Aquarium, situated in the heart of Melbourne’s CBD, is one of Victoria’s leading visitor attractions and an unforgettable outing for the whole family. Having 12 amazing zones of discovery, Sea Life Melbourne Aquarium is the very place that you cannot miss when you visit the city.

* Opening Times

     Sea Life Melbourne Aquarium is open from 9:30 am until 6:00 pm every day of the year, including public holidays. Last admission is at 5:00 pm, one hour before closing.

* Location ( 位置)

     Sea Life Melbourne Aquarium is located on the corner of Flinders Street and King Street, Melbourne. It is siyuated on the Yarra River, opposite Crown Entertainment Complex.

* Getting to Sea Life Melbourne Aquarium

     Train

     The Sea Life Melbourne Aquarium train stop is located on the free City Circle Tram route (公交线路) and also routes 70 and 75. City Circle trams run every 10 minutes in both directions.

     Shuttle Bus

     The Sea Life Melbourne Aquarium is a free bus service, stopping at key tourist attractions in and around the City. Running daily, every 15 minutes from 10:00 am to 4:00 pm.

      Car Parking

      While there is no public car parking at Sea Life Melbourne Aquarium, there are several public car parking lots available only a short walk away.

* Wheelchair Access

      Sea Life Melbourne Aquarium provides people in wheelchairs with full access to all 12 zones. Each floor also has wheelchair accessible toilets.

* Terms

      Tickets will be emailed to you immediately after purchase or you can download and print your ticket once payment has been accepted. Please print out all tickets purchased and present at the front entrance of Sea Life Melbourne Aquarium. No ticket, no entry!


同类题5

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白蝴蝶之恋

刘白羽

    春意甚浓了,但在北方还是五风十雨,春寒料峭,一阵暖人心意的春风刚刚吹过,又来了一阵冷雨。

    我在草地上走着,忽然,在鲜嫩的春草上看到一只雪白的蝴蝶。蝴蝶给雨水打落在地面上,沾湿的翅膀轻微地簌簌颤动着,张不开。它奄奄一息,即将逝去。它白得像一片小雪花,轻柔纤细,楚楚动人,多么可怜呀!

    她从哪儿来?要飞向哪儿去?我痴痴地望着它。忽然像有一滴圣洁的水滴落在灵魂深处,我的心灵给一道白闪闪的柔软而又强烈的光照亮了。

    我弯下身,小心翼翼地把白蝴蝶捏起来,放在手心里。

    这已经冻僵了的小生灵发蔫了,它的细细的足脚动弹了一下,就歪倒在我的手中。

    我哈着气,送给它一丝温暖,蝴蝶渐渐苏醒过来。它是给刚才那强暴的风雨吓懵了吧?不过,它确实太纤细了。你看,那白茸茸的像透明的薄纱似的翅膀,两根黑色的须向前伸展着,两点黑漆似的眼睛,几只像丝一样细的脚。可是,这纤细的小生灵,它飞出来是为了寻觅什么呢?在这阴晴不定的天气里,它表现出寻求者何等非凡的勇气。

    它活过来了,我竟感到无限的喜悦。

    这时,风过去了,雨也过去了。太阳明亮的光辉照满宇宙,照满人间,一切都那样晶莹,那样明媚,树叶由嫩绿变成深绿了,草地上开满小米粒那样黄的小花朵。我把蝴蝶放在一片盛满阳光的嫩叶上,我向草地上漫步而去了。但我的灵魂里在呐喊,开始像很遥远、很遥远……,我还以为天空中又来了风、来了雨,后来我才知道就在我的心灵深处:你为什么把一个生灵弃置不顾?……于是我折转身又走回去,又走到那株古老婆娑的大树那儿。谁知那只白蝴蝶缓缓地、缓缓地在树叶上蠕动呢!我不惊动它,只静静地看着。阳光闪发着一种淡红色,在那叶片上颤悸、燃烧,于是带来了火、热、光明、生命,雨珠给它晒干了,风沙给它扫净了,那树叶像一片绿玻璃片一样透明、清亮。

    我那美丽的白蝴蝶呀!我那勇敢的白蝴蝶呀!它试了几次,终于一跃而起,展翅飞翔,活泼伶俐地在我周围翩翩飞舞了好一阵,又向清明如洗的空中冉冉飞去,像一片小小的雪花,愈飞愈远,消失不见了。

    这时,一江春水在我心头轻轻地荡漾了一下。在白蝴蝶危难时我怜悯它,可是当它真的自由翱翔而去时我又感到如此失落、怅惘,“唉!人啊人……”

    我默默伫望了一阵,转身继续向青草地走去。