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【单选题】
啤酒发酵过程中两种酵母,上面酵母浮在表面,下面酵母沉在底部,其原因是 。
A.
生长温度不同
B.
菌体重量不同
C.
二氧化碳产生速率不同
D.
发酵培养基不同
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A.
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B.
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C.
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A.
a
B.
an
C.
the
D.
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A.
William Wordsworth
B.
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C.
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D.
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A.
shy
B.
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C.
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D.
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A.
正确
B.
错误
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