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【简答题】I came across with an old man in rags the other day, he was begging for a living. To be frank, I didn’t know how I ought to give him some money. On the one hand, I am not born in a rich family. On the...
【简答题】化学反应现象可以帮助我们判断化学反应是否发生，但有些化学反应并观察不到明显的现象．实验小组的同学们为了证明NaOH和稀盐酸能发生化学反应，从不同角度设计了实验方案，并进行实验． 【猜想与假设】NaOH和稀盐酸能发生化学反应． 【设计与实验】实验小组的同学们分工合作，按照如下方案分别进行了实验．甲方案：先在NaOH稀溶液中滴加几滴酚酞溶液，然后滴加稀盐酸．．乙方案：用pH试纸测定NaOH的pH，再滴...
【简答题】An old man us to the old house and told us his story.
【单选题】水杨酸和三氯化铁发生呈色反应的原理是
A.
在中性或弱酸性(pH4-6)介质中，水杨酸所含羧基和Fe3+成盐
B.
在中性或弱酸性(pH4-6)介质中，Fe3+氧化其所含酚羟基成醌
C.
在中性或弱酸性(pH4-6)介质中，水杨酸所含酚羟基与Fe3+生成有色配位化合物
D.
在中性或弱酸性(pH4-6)介质中，水杨酸所含酚羟基将Fe3+还原成Fe2+
E.
在中性或弱酸性(pH4-6)介质中，Fe3+水解
【简答题】A. lose B. lead C. the same as D. get on with An old man us to the old house and told us his history. The girl has question yours. I my key to the door of my bedroom yesterday. The boy and the girl...
【简答题】An old man ____ us to the old house and told us his story. (带领)
【单选题】The possibility never occurred to us _____ such an old man killed two women for money. [ ]
A.
how
B.
when
C.
what
D.
that
【单选题】An old man ______ us to the old house and told us his story.
A.
lead
B.
leading
C.
leads
D.
led
【简答题】An old man _______ us to the old house nd told us his story.
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