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【单选题】
目前血浆蛋白质定量的参考方法为A.
双缩脲比色法
B.
凯氏定氮法
C.
磺柳酸法
D.
盐析法
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A.
学习内容是一定的科学知识，
B.
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C.
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D.
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A.
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B.
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C.
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D.
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【单选题】Why did the man go to the luggage office?
A.
He went there to get his case.
B.
He went there to see a friend.
C.
He went there to buy something to eat.
D.
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