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【单选题】
一轮三羧酸循环有( )次脱氢反应,( )次脱羧反应。
A.
4,4
B.
4,2
C.
2,4
D.
1,2
E.
1,4
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举一反三
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A.
受精蛔虫卵
B.
未受精蛔虫卵
C.
钩虫卵
D.
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E.
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A.
makes grocery shopping easier
B.
makes grocery shopping complicated
C.
cuts down on efficiency
D.
will never be practical
【单选题】下列虫卵中,卵壳极薄的虫卵是()
A.
受精蝈虫卵
B.
未受精蝈虫卵
C.
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D.
钩虫卵
E.
蛲虫卵
【简答题】Helen ___(type and copy ) for two hours now in her office .
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