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A．石细胞腔内含草酸钙方晶 B．栅状石细胞内含硅质块 C．种子单细胞强烈 D．壁内腺腺体腔内有众多油滴 E．内胚乳为白色多角形厚壁细胞，壁，略作念珠状 马钱子
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【单选题】Why are some restaurants turning up the pressure to sell bottled water?
A.
Bottled water brings in huge profits.
B.
Competition from the wine industry is intense.
C.
Most diners find bottled water affordable.
D.
Bottled water satisfies diners' desire to be fashionable.
【简答题】U.S. Bottled Water Sales Are Booming Again Despite Opposition Despite organized anti-bottled-water campaigns across the country and a noisy debate about bottled water’s environmental impact, Americans...
【简答题】根据轴的承载情况不同,轴分为
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