有一包白色固体,可能含有Na2SO4、Na2CO3、BaCl2、KNO3中的一种

题型:选择题

问题:

有一包白色固体,可能含有Na2SO4、Na2CO3、BaCl2、KNO3中的一种或几种。取样溶于水,有白色沉淀产生;过滤后向沉淀中滴加稀盐酸,沉淀的量与加入盐酸体积的关系如下图所示。由此推断白色固体中

A.可能存在KNO3

B.可能存在Na2SO4

C.肯定只存在Na2CO3

D.肯定不存在BaCl2

考点:水(蒸气)的检验粗盐的提纯空气的检验物质的相互转化和制备
题型:选择题
Long long ago, there was a small village. This village had a  36  tradition. At the beginning of every year, any boy who had reached the age of 18 was given land and money to build a home. The boy had to   37 his home before winter. If his home failed to endure the cold weather in winter, the villagers could not  38  him in any way.
One   39 , Paul and Marc reached their 18. They   40  their land and money and decided to search nearby villages for ideas on building their homes. In each village, they found the nicest   41  and talked to the owners. Each owner gladly offered   42 .
After Marc saw several homes, he   43 the best ideas and went back to his own land. Paul, 44  , continued collecting more ideas. Soon he had so many great ideas that he began to 45  some of them. But he always believed he could find even better ideas in the next village.
Marc began building his home. He had several false starts,  46  his home gradually rose from his land. By fall, Marc had finished his home. It wasn't perfect, but it was strong and he could  47 it later. Paul enjoyed all the beautiful homes and   48  with home owners. The first snow came and Paul, realizing he was running out of time,  49  back to his land. He built the best home he could in the time he had, but it was   50  . The first winter storm destroyed his home and he froze to   51 . The villagers mourned for him.
Marc  52 the winter. Each year, Marc searched for other good ideas he could use to make his own home look better. He became a leader in the village,  53 a family, and lived a happy, content life.
We all build and improve our own mental homes. It’s   54  and fun for us to search for ideas from other mental home owners, but we only improve our own mental home if we actually  55   the best ideas.
小题1:
A.hopefulB.strangeC.literaryD.cultural
小题2:
A.findB.makeC.buy D.complete
小题3:
A.encourage B.helpC.scoldD.persuade
小题4:
A.winterB.summerC.spring `D.autumn
小题5:
A.receivedB.exchangedC.recognizedD.advised
小题6:
A.girlsB.jobsC.presentsD.houses
小题7:
A.roomsB.drinksC.adviceD.attention
小题8:
A.gatheredB.expectedC.createdD.understood
小题9:
A.similarlyB.finallyC.furthermoreD.however
小题10:
A.believeB.forgetC.replaceD.doubt
小题11:
A.becauseB.althoughC.soD.but
小题12:
A.repairB.rebuildC.improveD.sell
小题13:
A.achievementsB.conversationsC.strugglesD.arguments
小题14:
A.rushedB.droveC.flewD.moved
小题15:
A.funnyB.weakC.smallD.amazing
小题16:
A.deathB.blindnessC.sadnessD.illness
小题17:
A.experiencedB.lovedC.spentD.survived
小题18:
A.broughtB.earnedC.raisedD.contacted
小题19:
A.easyB.slowC.dangerousD.special
小题20:
A.realizeB.bringC.applyD.collect
题型:选择题

下面四项内容中,属于城市燃气工程系统分区规划内容的是( )。

A.确定燃气输配设施的分布、容积和用地

B.确定燃气输配管网的级配等级,布局输配干线管网

C.进行造价估算

D.确定燃气输配设施的保护要求

题型:选择题

一位美国青年,想了解自己国家的历史,并决定按照独立战争的进程进行一次实地考察,下列考察路线正确的是:

①来克星顿    ②波士顿   ③萨拉托加    ④约克镇

A.①③②④

B.③①②④

C.①③④②

D.②①③④

题型:选择题

男性儿童10岁,身高1米,智力低下。应考虑为哪一种内分泌激素分泌障碍()

A.生长激素

B.甲状腺激素

C.肾上腺皮质激素

D.胰岛素

E.性激素

题型:选择题

其他食品经营者应当设置独立的食品柜(架)。

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