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在托盘天平两边各放一只等质量的烧杯,在两只烧杯里分别加入50g溶质质量分数为7.3%的稀盐酸,将天平调节至平衡;然后向左右两烧杯中分别加入一定质量的下列各组物质,充分反应后,天平发生偏转的是

在托盘天平两边各放一只等质量的烧杯,在两只烧杯里分别加入50g溶质质量分数为7.3%的稀盐酸,将天平调节至平衡;然后向左右两烧杯中分别加入一定质量的下列各组物质,充分反应后,天平发生偏转的是
题目:在托盘天平两边各放一只等质量的烧杯,在两只烧杯里分别加入50g溶质质量分数为7.3%的稀盐酸,将天平调节至平衡;然后向左右两烧杯中分别加入一定质量的下列各组物质,充分反应后,天平发生偏转的是 A.1.8g铝粉和1.8g 铁粉 B.4.2g碳酸镁和2g硝酸银 C.5.6g铁粉和5.6g 锌粉 D.10g碳酸钙和5.6g氧化钙 喵查答案:A ……继续阅读 »

阅读《生于忧患,死于安乐》,完成第10—12题。

阅读《生于忧患,死于安乐》,完成第10—12题。
题目:阅读《生于忧患,死于安乐》,完成第10—12题。 ①舜发于畎亩之中,傅说举于版筑之间,胶高举于鱼盐之中,管夷吾举于士,孙叔敖举于海,百里奚举于市,故天将降大任于是人也,必先苦其心志,劳其筋骨,饿其体肤,空乏其身,行拂乱其所为,所以动心忍性,曾益其所不能。 ②人恒过然后能改,困于心衡于虑而后作,征于色发于声而后喻。入则无法家拂士,出则无敌国外患者,国恒亡……继续阅读 »

9. —Can you play basketball

9. —Can you play basketball
题目:9. —Can you play basketball —Yes, I_________ . A. am B. do C. must D. can 喵查答案:D 9.D【解析】由情态动词can进行的提问,也要用 can来回答,故选D. ……继续阅读 »

“神州七号”宇宙飞船在太空遨游,来自齐齐哈尔的宇航员翟志刚完成了“太空行走”,当时他与地面指挥部的联系是通过 _____________ 来传递信息的。当飞船返回舱返回时进入大气层后与空气摩擦,是将机械能转化为 __________________能。

“神州七号”宇宙飞船在太空遨游,来自齐齐哈尔的宇航员翟志刚完成了“太空行走”,当时他与地面指挥部的联系是通过 _____________ 来传递信息的。当飞船返回舱返回时进入大气层后与空气摩擦,是将机械能转化为 __________________能。
题目:“神州七号”宇宙飞船在太空遨游,来自齐齐哈尔的宇航员翟志刚完成了“太空行走”,当时他与地面指挥部的联系是通过 _____________ 来传递信息的。当飞船返回舱返回时进入大气层后与空气摩擦,是将机械能转化为 __________________能。 喵查答案: 电磁波 (无线电波或无线电)  内   ……继续阅读 »

I1. (2009重庆)研究发现,达菲(Tamiflu)对甲型HIM流感病毒有抑制作用,从香料八角中提取的莽草酸(C7H6O5)是合成达菲的原料之一。下列对莽草酸的说法不正确的是( )

I1. (2009重庆)研究发现,达菲(Tamiflu)对甲型HIM流感病毒有抑制作用,从香料八角中提取的莽草酸(C7H6O5)是合成达菲的原料之一。下列对莽草酸的说法不正确的是( )
题目:I1. (2009重庆)研究发现,达菲(Tamiflu)对甲型HIM流感病毒有抑制作用,从香料八角中提取的莽草酸(C7H6O5)是合成达菲的原料之一。下列对莽草酸的说法不正确的是( ) A.莽草酸是氧化物 B.它由碳、氢、氧元素组成 C.氢元素质量分数最小 D.碳、氢、氧原子个数比为7:6:5 喵查答案:A ……继续阅读 »

London-is such a wonderful city.It is very large.The Thames River runs (11) the city from west to east. So the city has (12) parts: the South and the North. In the North, there are important buildings, shops, big parks and interesting places. the weather in London is good. In winter it is not very cold and in summer it is not very hot (13) the city is near the sea. People say (14 ) London is a foggy city and it often rains. It is true.Last year,when l (15) in London, Imet one of the (16) fogs in years. You could hardly see your hands in front of your face. Cars and buses moved -along with their lights on.When evening fell, the weather (17 ) even worse. The fog was as thick as milk.(18) the buses and cars stopped. I happened (19 ) . an important meeting on the other side of the town, but it was impossible to find a car. I had to get there (20) .

London-is such a wonderful city.It is very large.The Thames River runs (11) the city from west to east. So the city has (12) parts: the South and the North. In the North, there are important buildings, shops, big parks and interesting places. the weather in London is good. In winter it is not very cold and in summer it is not very hot (13) the city is near the sea. People say (14 ) London is a foggy city and it often rains. It is true.Last year,when l (15) in London, Imet one of the (16) fogs in years. You could hardly see your hands in front of your face. Cars and buses moved -along with their lights on.When evening fell, the weather (17 ) even worse. The fog was as thick as milk.(18) the buses and cars stopped. I happened (19 ) . an important meeting on the other side of the town, but it was impossible to find a car. I had to get there (20) .
题目:London-is such a wonderful city.It is very large.The Thames River runs (11) the city from west to east. So the city has (12) parts: the South and the North. In the North, there ……继续阅读 »

(2009重庆)(5分)在汽油中加入适量乙醇就得到乙醇汽油。

(2009重庆)(5分)在汽油中加入适量乙醇就得到乙醇汽油。
题目:(2009重庆)(5分)在汽油中加入适量乙醇就得到乙醇汽油。 (1)乙醇(C2H5OH)在空气中充分燃烧的化学方程式为 。 (2)关于乙醇汽油的下列说法中不正确的是 (填序号)。 A.乙醇属于可再生性能源 B.乙醇汽油不能用作汽车燃料 C.使用乙醇汽油可减少大气污染 D.使用乙醇汽油可节省石油资源’ (3)汽车尾气中含有CO、 NO,一种新型催化剂能使……继续阅读 »