题干

下列是宜昌市上海中学某化学学习小组在“人吸入的空气和呼出的气体中有什么不同”的探究活动中提出的一些说法,其中错误的是(    )

A:证明呼出的气体含二氧化碳多的证据是:呼出的气体能使澄清石灰水变浑浊

B:判断呼出的气体含氮气的依据是:空气中含有氮气,而氮气不为人体吸收

C:证明呼出的气体含水蒸气多的证据是:呼出的气体在玻璃片上结下水珠

D:证明呼出的气体含氧气的证据是:呼出的气体能使木条燃烧更旺

上一题 下一题 0.0难度 选择题 更新时间:2017-12-22 05:19:00

答案(点此获取答案解析)

D

同类题4

阅读理解

    Personal planes which can take off noiselessly from the back garden will be possible within two years.

    Lilium Aviation is inventing an electric two-seater airplane which  takes just 20 hours to learn to fly and can travel at speeds of  250mph.More importantly, the small plane, which weighs just 25kg, can take off vertically which means it does not need to fly from an airport, but could be parked outside a house or in a garden. The company says the design will “open the door to a new class of simpler, quieter and environmentally friendly planes” and will be possible from 2018.

    “Our goal is to develop an airplane for use in everyday life,” said Daniel, CEO and one of the company's four founders. "We are going for a plane that can take off and land vertically and does not need the difficult and expensive infrastructure of an airport.

    Although helicopters offer a choice, they are very noisy and difficult to fly and require expensive licenses. They also have no backup if the rotor fails, making them costly to build and keep. While firstly limited to airfields, the Lilium airplane will eventually take off vertically from almost anywhere – even from back gardens – it needs only an open flat area of 50 ft. by 50ft (15 m x 15m).

    The plane is classed as a Light Sport Aircraft for two users, with the pilot's license requiring 20 hours' minimum training – almost like taking a driving license. It is intended for fun flying during daylight, in good weather conditions and in least crowded airspace up to 3 km altitude. The airplane would have to follow the same flight laws as helicopters.

同类题5

阅读材料,回答问题。

  材料一  在明代,出现了许多新的名词,反映了飞速发展与变化的社会生活。明代俗谚道:苏州样,广州匠。明代广东人颇为崇尚“奇器”,而番舶贸易的存在及其发展,使广州人可以充分享用来自东、西洋的金银之器。广州所造锡器,号称天下最良;广州佛山镇所产的铁锅,更是行销天下。所谓“苏州样”,即“苏意”,就是苏州已经成为领导天下时尚之都。凡衣服式样,新鲜、离奇,一概称之为“苏样”;见到别的稀奇鲜见的事物,也成为“苏意”。 “时玩”则是明代出现的新词,宣德铜器、成化窑器,都是明代的时玩。时玩之风,滥觞于江南的好事缙绅,最后经徽州那些巨商大贾推波助澜,遂成全社会风气。同时,沈周、唐寅之画,文徵明、祝允明之书法,无不成为人们收藏的抢手的“时玩”。“杭州风”一词,也是明代各地相当流行的新词。这缘于杭州人喜欢掺假,如酒掺灰、鸡塞沙、鹅、羊吹气,鱼、肉注水,织作刷油粉,外面漂漂亮亮,里头却是空心甚至腐败。明代中期后,随着生产力发展、商业繁荣之后,也有一个从温饱向奢华的过渡。所谓“新开门七件事”:诙谐、听曲、游玩、博弈、买春、收藏、花虫鱼鸟。其中既有大众百姓逗闷的乐子,也有文人士大夫打发闲暇的雅趣。即生活的享乐化与艺术化。             摘编自陈宝良《明代社会生活史》

 材料二  中国文字,论其字形,则非拼音而为象形之末流,不便于识,不便于写;论其字义,则意义含糊,文法极不精密;论其在今日学问上之应用,则新理新事新物之名词,一无所有;论其过去之历史,则千分之九百九十九为记载孔门学说及道教妖言之记号。此种文字,断断不能适用于二十世纪之新时代……欲使中国不亡,欲使中国民族为二十世纪文明之民族,必以废孔学、灭道教为根本之解决,而废记载孔门学说及道教妖言之汉文,尤为根本解决之根本解决。中国文字,迟早必废。而循之进化公例恐终无可逃。 

——摘编自陈独秀、钱玄同言论《新青年》(1918年)