热点试题

[ 数学 ] 如图,反比例函数y=kx的图象与一次函数y=mx+b的图象相交于两点A(1,3),B(n,

如图,反比例函数y=
k
x
的图象与一次函数y=mx+b的图象相交于两点A(1,3),B(n,-1).
(1)分别求出反比例函数与一次函数的函数关系式;
(2)若直线AB与y轴交于点C,求△BOC的面积.

2016-05-18 | 0

[ 数学 ] (1)计算:++(﹣1)0﹣2sin45°=(    );(2)化简:=(    )。

(1)计算:++(﹣1)0﹣2sin45°=(    );
(2)化简:=(    )。

2016-05-18 | 0

[ 数学 ] 下列说法正确的是( )A.两个能重合的三角形一定成轴对称B.两个能重合的三角形一定成中心对

下列说法正确的是(  )
A.两个能重合的三角形一定成轴对称
B.两个能重合的三角形一定成中心对称
C.成轴对称的两个图形中,对应线段平行且相等
D.成中心对称的两个图形中,对应线段平行(或在同一直线上)且相等

2016-05-19 | 0

[ 数学 ] 在平面直角坐标系中,以点(2,1)为圆心,1为半径的圆必与 [     ] A.x轴相交B

在平面直角坐标系中,以点(2,1)为圆心,1为半径的圆必与[    ]
A.x轴相交
B.y轴相交
C.x轴相切
D.y轴相切

2016-05-20 | 0

[ 数学 ] 学校篮球队队员的平均身高是160厘米,朱帆是学校篮球队队员,他的身高 [     ] A.

学校篮球队队员的平均身高是160厘米,朱帆是学校篮球队队员,他的身高[    ]
A.定是160厘米    
B.不可能是155厘米
C.可能比160厘米高,也可能比160厘米矮

2016-05-21 | 0

[ 语文 ] “大自然每一次剧烈的运动,总要破坏和毁灭一些什么,但也总有一些顽强的生命,不会屈服,绝不会

“大自然每一次剧烈的运动,总要破坏和毁灭一些什么,但也总有一些顽强的生命,不会屈服,绝不会屈服啊!”这句话蕴涵了什么哲理呢?
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2016-05-27 | 0

[ 语文 ] 现代文阅读。 绿色洗涤        从发明肥皂以来,我们的祖先和前辈都一直在用肥皂洗衣服

现代文阅读。
绿色洗涤
       从发明肥皂以来,我们的祖先和前辈都一直在用肥皂洗衣服。由于肥皂是以食用油为主的纯天然物质制成的,不会对环境和人类造成伤害,所以,用肥皂洗涤衣物,保持了人与自然的和谐。
       第二次世界大战后,许多国家食用油严重匮乏,无法用于制造肥皂。德国人率先用石油化工的副产品研制出合成洗衣粉,成为一代新的洗涤用品。二十世纪60年代初期,我国也在类似的背景下开发了合成洗衣粉和洗涤剂,并积极推广。由于洗衣粉价格低廉、使用方便、去污力强,所以它迅速为消费者接受,得到广泛的使用。
       ①然而,洗衣粉是由多种化工原料合成的,含磷、含苯、含荧光剂。②它的主要成分是三聚磷酸钠、烷基苯磺钠和荧光增白剂。③这些成分都是实实在在的有毒有害物质。④三聚磷酸钠对水资源会造成严重污染,使水产生“富营养化”,使江、河、湖、海的藻类等浮游生物大量繁殖,水的含氧量下降,水质恶化混浊。⑤这样的水体,人畜不能使用,鱼虾难以生存。⑥严重时水质发黑,腥臭熏人。⑦据有关部门测算,我国每年消耗固体洗衣粉300万吨,液体洗涤剂100万吨,其中大量的磷被排入水中,便成了可怕的巨大污染源。⑧调查表明:我国的太湖、巢湖、滇池、淮河、海河、辽河等的严重污染,除工业废水外,与含磷洗衣粉有着不可分割的联系。
       此外,洗衣粉中所含的苯和荧光增白剂,极富毒性,用手接触或残留在衣物上,对人体皮肤有强烈的刺激作用,长期使用会引起皮炎,使人体细胞发生变异,影响生育能力,诱发癌症。
       为了保护我们赖以生存的环境,为了保护人类的健康,痛下决心彻底淘汰洗衣粉,回归自然,重新拿起祖先用过的肥皂洗衣,已经成为世界各国环保专家的共识。但是,肥皂有黏性高、不易溶解、使用不便的缺点,无法适应现代人生活快节奏的需要,尤其无法用于洗衣机洗衣。
       为了解决这个难题,世界各国的科技工作者都在积极探索。我国的大丹宜(南京)化工有限公司的科研人员经过多年的努力和刻苦攻关,终于成功地突破了肥皂不易溶解问题的瓶颈,攻克了这座堡垒,研制出了新一代环保绿色洗涤用品——肥皂粉。它的问世,受到了世界各国的关注。
       这种肥皂粉的生产工艺是,从纯天然的棕榈油、椰子油中精炼油脂,除去杂质,然后加水分解,经真空蒸馏和浓缩后,加入绝净脂肪酸,然后进行皂化反应,制成皂浆,经特殊工艺进行调皂处理,实现溶解,最终生产成肥皂粉成品。
       新一代肥皂粉的研制成功,既保持了肥皂无磷、无苯、无荧光剂的天然特性,又具有洗衣粉使用方便、去活力强的特点,适应了现代生活的需求。它使人们在更高层次上实现了洗衣"返璞归真,回归自然"的愿望,真正实现了绿色洗涤,对保护环境和人类健康产生深远影响。
1.从本文介绍的内容看,洗涤用品的发展经历了哪些阶段?
      _______________________________________________________________________
2.用“||”将第三段的8句话划分成两个层次。
     ① ② ③ ④ ⑤ ⑥ ⑦ ⑧
3.文中的“新一代环保绿色洗涤用品”在原有洗涤用品的基础上解决了哪两大难题?
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2016-05-27 | 0

[ 语文 ] “庭下如积水空明,水中藻荇交横,盖竹柏影也。”一句描写了那几种景物?他们有什么特点?给我

  “庭下如积水空明,水中藻荇交横,盖竹柏影也。”一句描写了那几种景物?他们有什么特点?给我们营造了一种怎样的境界?对其写景的妙处试作简要的分析。
                                                                                                                                                           
                                                                                                                                                           

2016-05-27 | 0

[ 英语 ] Jack went to a barber's shop and had his hair


Jack went to a barber's shop and had his hair cut, but when he came out, he was not happy with the result(结果). When his friend Bob saw him, he laughed and said, "What has happened to your hair, Jack?"
Jack said, "I tried a new barber's shop today, because I wasn't quite satisfied with my old one, but this one seems even worse."
Bob agreed(同意). "Yes, I think you're right, Jack. Now I'll tell you what to do when you go into a barber's shop next time: look at all the barber's hair, find out whose hair looks worst, and then go straight to him."
"Why shall I go to him?" Jack asked. "But that would be foolish!"
"Oh, no, it wouldn't," answered Bob. "Who cut that man's hair? Just think it. He couldn't cut it himself, could he? Another of the barbers cut it. So you know he can't be the worst barber."
小题1:When Jack went out of the barber's shop, he was not happy because                      ____.
A.nobody had cut his hair
B.the barber hadn't cut his hair well
C.the barber had cut his hair carefully
D.he was not satisfied with his old barber
小题2:"I tried a new barber's shop today." means ____.
A.this barber's shop was a new one
B.this was the only barber's shop in this town
C.Jack often went to this barber's shop
D.Jack had not been to this barber's shop before
小题3:After Jack had his hair cut, he thought ____.
A.the new barber's shop was the best one
B.the old barber's shop wasn't so good as the new one
C.the new barber's shop was worse than the old one
D.the old barber's shop was the worst one
小题4:Bob told Jack to find out which barber's hair looked the worst and then go straight to him. Why?
A.Because he was certainly the best barber.
B.Because he was free all the time.
C.Because he was the worst barber.
D.Because he wasn't the worst barber.
小题5:From the story we know that ____.
A.it's foolish to have one's hair cut at a barber's shop
B.barbers cut each other's hair
C.barbers never have their hair cut
D.a barber always cuts his hair by himself

2016-05-27 | 0

[ 英语 ] Julie is one of the women who always _____ wi

Julie is one of the women who always _____ with latest fashions.[    ]
A. keeps up
B. get along  
C. keep pace     
D. fits in

2016-05-28 | 0