题干

下列化学方程式书写正确的是(  )


A:Fe2O3+4HCl═2FeCl2+3H2O

B:CuSO4+2NaOH═Cu(OH)2↓+Na2SO4

C:3Fe+2O2= Fe3O4

D:2KNO3+CaCl2═2KCl+Ca(NO3)2

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答案(点此获取答案解析)

B

同类题2

阅读下面的文言文,完成各题。

    陈希亮,字公弼。幼孤好学,年十六,将从师,其兄难之,使治钱息三十余万。希亮悉召取钱者,焚其券而去。业成,乃召兄子庸、谕使学,遂俱中天圣八年进士第。初,希亮以母老,为县侍亲。母终,服除,为开封府司录司事。期年,殿侍雷甲以兵百余人逐盗竹山,甲不能戢,所至为暴。或疑为盗,告希亮盗入境,且及门。希亮即勒兵阻水拒之,命持满无得发,士皆植立如偶人。甲射之,不动,乃下马拜请死,吏士皆欲斩甲以徇,希亮独治为暴者十余人,使甲以捕盗自赎。

    皇佑元年,移滑州。奏事殿上,仁宗劳之曰:“知卿疾恶,无惩沈氏子事。”未行,诏提举河北便籴。都转运使魏瓘劾希亮擅增损物价。会河溢鱼池埽,且决,希亮悉召河上使者,发禁兵捍之。庐于所当决,吏民涕泣更谏,希亮坚卧不动,水亦去,人比之王尊。数上章请老,不允,移知凤翔。仓粟支十二年,主者以腐败为忧,岁饥,希亮发十二万石贷民。有司惧为擅发,希亮身任之。是秋大熟,以新易旧,官民皆便。于阗使者入朝,过秦州,经略使以客礼享之。使者骄甚,留月余,坏传舍什器,纵其徒入市掠饮食,民户皆昼闭。希亮闻之曰吾尝主契丹使得其情使者初不敢暴横皆译者教之吾痛绳以法译者惧其使不敢动矣况此小国乎乃使教练使持符告译者曰:“入吾境,有秋毫不如法,吾且斩若。”使者至,罗拜庭下,无一人哗者。英宗即位,迁太常少卿。始,州郡以酒相饷,例皆私有之,而法不可。希亮以遗游士之贫者,既而曰:“此亦私也。”以家财偿之。遂借此上书自劾,求去不已,坐是分司西京。未几致仕,卒,年六十四。

(节选自《宋史·陈希亮传》)

同类题5

请认真阅读下面短文,并根据短文内容回答问题。
   We parents like to make sure that our children are eating well and getting all the nutrients(营养)they need. Children need two or three kinds of vegetables every day.
   A simple way to get children to eat vegetables is eating them ourselves. Following our habit, they may start eating vegetables. Don’t say things like, “If you eat your vegetables, you can have desserts(餐后甜食).” These methods work for a while but can possibly lead them to disliking vegetables more. Giving your children new varieties(多样性) which will help her or him develop a taste for trying new things.
Sometimes the simple things just don’t work. We have to start becoming a little creative when it comes to make our children eat these vegetables. By doing this in the beginning when they are small, it will hopefully help them learn to love vegetables.
   Think of creative ways to make children eat vegetables. For example, cut up vegetables like carrots, tomatoes, and assemble (集合) a creative way on a plate for an afternoon snack. Or try using cheese sauce either by dipping(浸)vegetables or by putting the cheese right on top of the uncooked vegetables.
   If you prefer, you can also add a teaspoon of sugar on top of cooked green beans and peas to give them a little sweeter taste. Doing this shouldn’t lead to a sweet tooth as long as you only give them a small amount.
   If you have a child that refuses to eat vegetables, some of these suggestions I’ve listed will help to turn that around. In the end, you’re not just getting them to eat vegetables, you are helping them to live a healthier lifestyle.
根据短文内容回答以下问题: