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【单选题】
用铁铵矾指示剂法测定氯化物的含量时,为了避免AgCl沉淀发生转化,可采用的措施有()A.
滴定时应快速振荡
B.
在用NH4SCN滴定前，向溶液中加入硝基苯保护AgCl沉淀
C.
提高铁铵矾指示剂浓度
D.
控制好溶液的酸度
E.
控制好滴定的速度
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举一反三
【简答题】四大天然纤维中短纤维有( )、( )。
【单选题】听力原文： Before World War n, we spent our summer holidays in Hungary. I have only the dim memory of the house we lived in, of my room and my toys. Nor do I recall clearly the large family of grandparents...
A.
He was first of all a scientist.
B.
He was not only a naturalist but also a scientist.
C.
He was no more than a born naturalist.
D.
He was a scientist as well as a naturalist.
【单选题】听力原文： Before World War II, we spent our summer holidays in Hungary. I have only the dim memory of the house we lived in, of my room and my toys. Nor do I recall clearly the large family of grandparent...
A.
Because the family was extremely large.
B.
Because he didn't live very long with them.
C.
Because he was too young when he lived with them.
D.
Because he was fully occupied with observing nature.
【单选题】在 bootstrap中,以下的()不是文本对其的方式。
A.
.text-left
B.
.text-middle
C.
.text-right
D.
.text-justify
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