题干

下列实验方案能达到相应实验目的的是(    )

选项

实验目的

实验方案

A

分离Fe2O3、Al2O3

将混合物投入足量NaOH溶液中然后依次进行过滤、洗涤、蒸发、灼烧四项操作

B

验证淀粉溶液水解生成葡萄糖

向淀粉溶液中加入稀硫酸共热,冷却后再加入新制Cu(OH)2悬浊液,加热

C

证明:Ksp(Ag2CrO4)<Ksp(AgCl)

向浓度均为0.1mol/L的KC1和K2CrO4的混合溶液中逐滴加入AgNO3溶液

D

检验FeCl2晶体是否完全变质

取少量久置的FeCl2晶体于试管中,逐滴加入酸性高锰酸钾溶液

A:A   

B:B   

C:C   

D:D

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答案(点此获取答案解析)

D

同类题2

    阅读短文,掌握人意,然后从所给的A、B、C、D四个选项中选出最佳选项。

    My family and I were taking a long-expected vacation to Disneyland. I had never been there before and was1to experience the magic.

    There was another reason that this trip was2. Being a workaholic(工作狂),my father worked long hours.I longed to spend time with him. I wanted to be able to3with my father, who I loved more than life,and just talk. It always seemed like there was never time.

    The day finally arrived 4I was allowed to pack my luggage(行李).I chose only my favorite clothes,then tried to zip(拉拉链)up the bag full of clothes.I didn't get any5that night.I lay in my bed,feeling6.My father's work was going to be left at home,finally.

    After breakfast we hit the open road.It was smooth sailing for the first hour7I unexpectedly felt a sudden move.We coasted to the roadside,and my dad said8was wrong with the engine(引擎).We were in the middle of the passing9,so he decided the easiest thing to do would be to flag someone down and get a ride into town.

    An hour later, my dad was still10 his hands at each and every passing car but it wasn't doing any good.Nobody would stop to11my family.Finally my dad gave up and decided to walk into town.It was a very long 12.My dad has a back problem and he wasn't in any condition to even walk a couple of miles.I 13him to stay and try again,but he refused,"I won't let anything stop you enjoying this trip."

    My 14had a pain as he put on his coat and began to walk away.Then I saw a person out of our car window. A man with a 15smile was heading straight toward our car…