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【多选题】
能用于滴定分析的化学反应必须符合哪些条件A.
反应定量地完成，即反应按一定的反应式进行，无副反应发生，而且进行完全（ 99.9 ％）
B.
反应速率要快
C.
能用较简便的方法确定滴定终点
D.
反应只生成一种产物
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Never eat food that stays overnight, _____ it tastes _____. [ ]
A.
if; good
B.
but; well
C.
even though; good
D.
even if; well
【单选题】Sally, a shy girl, never speaks in public _______ she is asked to, never!
A.
until
B.
unless
C.
even though
D.
as though
【简答题】My teachers suggested that I see a speech specialist (专家) in school. I never really gave much thought to my speech. If other people understood what I was saying, then that was good enough. I didn’t mi...
【简答题】先化简,后求值: ,其中a=-2.(把书写的过程写在纸上,并拍照在答案处上传照片)
【单选题】_____he studies hard, he will never pass the examination.
A.
If
B.
Unless
C.
Even if
D.
Even though
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