皮皮学，免费搜题
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【单选题】
测得某一蛋白质样品的氮含量为0.40g,此样品约含蛋白质多少A.
2.00g
B.
2.50g
C.
6.40g
D.
3.00g
E.
3.50g
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A.
10
B.
20
C.
30
D.
40
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A.
many kinds
B.
much kinds
C.
many kind
D.
much kind
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