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反馈参考答案：
举一反三
【多选题】样品在薄层色谱上展开，10min时有一Rf值，则20min 时的展开结果是（ ）。
A.
R f 值加倍
B.
Rf 值不变
C.
样品移行距离增加，但小于 2 倍
D.
样品移行距离增加，但大于 2 倍
【简答题】Napping to a Healthier Heart? Researchers say they have developed a test that can tell if a person with heart disease isl ikely to suffer a heart attack.The test measures levels of a protein in...
【单选题】Harry and Sam both denied that the fight was their .
A.
blame
B.
criticism
C.
cause
D.
fault
【简答题】実力養成編V P70 練習5 (2)
【简答题】我们学校是一所 民办 学校。
【单选题】In the recent past, medical researchers have shown that heart disease is associated with certain factors in our day-to-day lives: with stress, with smoking, with poor nutrition (营养), and with a (51) o...
A.
shortage
B.
failure
C.
plenty
D.
lack
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