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【简答题】
下列关于薄层色谱法的优点错误的是（）。
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举一反三
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【简答题】After stepping into the classroom, I glanced round all the students and began my following words. “Thank you” are my 小题1: words, which I would like to use to express my deepest 小题2: to all of you. Thi...
【简答题】Stepping into a pool of water is common enough, but who could ever imagine stepping into a pool of fish? In February of 1974, Bill Tapp, an Australian farmer, saw a rain of fish that covered his farm....
【单选题】On stepping into the room this morning, I was astonished to find the floor covered with _______ looked like tiny insects.
A.
that
B.
what
C.
where
D.
when
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