题干

下列四项基本实验操作中,正确的是(  )

A: 测物体的质量

B: 检查气密性

C: 测空气中氧气含量

D: 盛CH4集气瓶放置

上一题 下一题 0.0难度 选择题 更新时间:2019-03-16 07:34:43

答案(点此获取答案解析)

D

同类题4

阅读理解

Throughout the history of the arts, thenature of creativity has remained constant to artists.Nomatter what objects they select, artists are to bring forth new forces andforms that cause change---to find poetry where no one has ever seen orexperienced it before.

Landscape (风景) isanother unchanging element of art.It can be found from ancient timesthrough the17th-century Dutch painters to the 19th-century romanticists andimpressionists.Inthe 1970s Alfred Leslie, one of the new American realists, continued thispractice.Lesliesought out the same place where ThomasCole, a romanticist, had producedpaintings of the same scene a century and a half before.UnlikeCole who insists on a feeling of loneliness and the idea of finding peace innature, Leslie paints what he actually sees.In his paintings, there is no particularchange in emotion, and he includes ordinary things like the highway in thebackground.Healso takes advantage of the latest developments of color photography to helpboth the eye and the memory when he improves his painting back in his workroom.

Besides, all art begs the age-oldquestion: What is real? Each generation of artists has shown theirunderstanding of reality in one form or another.The impressionists saw reality in briefemotional effects, the realists in everyday subjects and in forest scenes, andthe Cro-Magnon cave people in their naturalistic drawings of the animals in theancient forests.Tosum up, understanding reality is a necessary struggle for artists of allperiods.

Over thousands of years the function ofthe arts has remained relatively constant.Past or present, Eastern or Western, thearts are a basic part of our immediate experience.Many and different are the faces ofart,and together they express the basic need and hope of human beings.

同类题5

现代文阅读 ,回答相关问题。
                                                                                     每一棵草都会开花
       ①回乡下,跟母亲一起到地里去,惊奇地发现,一种叫牛耳朵的草,开了细小的黄花。那些小小的花,羞涩地藏在叶间,不细看,还真看不出。
       ②我问:“怎么草也开花?”
       ③母亲笑着扫过一眼来,淡淡说:“每一棵草,都会开花的。”
       ④我愣住了,细想,还真是这样。蒲公英开花是众所周知的,开成白白的绒球球,轻轻一吹,满天飞花。狗尾巴草开的花,就像一条狗尾巴,若成片,是再美不过的风景。蒿子开花,是大团大团的……就没见过不开花的草。
       ⑤曾教过一个学生,很不出众的一个孩子,皮肤黑黑的,还有些耳聋。因不怎么听见声音,他总是竭力张着他的耳朵,微向前伸了头,作出努力倾听的样子。这样的孩子,成绩自然好不了,所有的学科竞赛,譬如物理竞赛,化学竞赛,他都是被忽略的一个。甚至,学期大考时,他的分数,也不被计入班级总分。所有人都把他当残疾,可有,可无。
       ⑥他的父亲,一个皮肤同样幽黑的中年人,常到学校来看他,站在教室外。他回头看看窗外的父亲,也不出去,只送出一个笑容。那笑容真是灿烂,盛开的野菊花般的,有大把阳光息在里头。我很好奇他绽放出那样的笑,问他:“为什么不出去跟父亲说话?”他回我:“爸爸知道我很努力的。”我轻轻叹一口气,在心里。有些感动,又有些感伤。并不认为他,可以改变自己什么。
       ⑦学期要结束的时候,学校组织学生手工竞赛,是要到省里夺奖的,这关系到学校的声誉。平素的劳技课,都被充公上了语文、数学,学生们的手工水平,实在有限,收上去的作品,很令人失望。这时,却爆出冷门,有孩子送去手工泥娃娃一组,十个。每个泥娃娃,都各具情态,或嬉笑,或遐想。活泼、纯真、美好,让人惊叹。作品报上省里去,顺利夺得特等奖。全省的特等奖,只设了一名,其轰动效应,可想而知。
       ⑧学校开大会表彰这个做出泥娃娃的孩子。热烈的掌声中,走上台的,竟是黑黑的他——那个耳聋的孩子。或许是第一次站到这样的台上,他神情很是局促不安,只是低了头,羞涩地笑。让他谈获奖体会,他嗫嚅半天,说:“我想,只要我努力,我总会做成一件事的。”
       ⑨刹那间,台下一片静。
       ⑩从此面对学生,我再不敢轻易看轻他们中任何一个。他们就如同乡间的那些草们,每棵草都有每棵草的花期,哪怕是最不起眼的牛耳朵,也会把黄的花,藏在叶间。开得细小而执著。