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【单选题】
凝胶过滤法分离蛋白质时,从层析柱上先被洗脱下来的是:
A.
分子量大的
B.
分子量小的
C.
电荷多的
D.
电荷少的
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【单选题】柴油机实现换向的基本要求是 。
A.
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B.
相同的凸轮位置和轮廓线
C.
相同的定时和发火顺序
D.
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