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【单选题】
在 Sephadex G75 分离纯化酪蛋白 实验中,核黄素何时加入样品溶液中?A.
在称量完酪蛋白粉末后就加入核黄素一起加热
B.
先称取核黄素加热溶解再加入酪蛋白粉末
C.
酪蛋白粉末加热溶解后再加入核黄素
D.
酪蛋白粉末加热溶解离心后再加入核黄素
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