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【单选题】
将两段寡聚脱氧核苷酸片段5'-ACCACGTAACGGA-3'和5'-GTTAC-3'与DNA聚合酶一起加到含有dATP、dGTP、dCTP和dTTP的反应混合物之中，预测反应的终产物被参入的各碱基的比例是A.
2C:1T
B.
1G:1T
C.
3G:2T
D.
3G:3T:2C
E.
5T:4G:3C:1A
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【单选题】设计一直动从动件盘形凸轮,当凸轮转速 ω及从动件运动规律 v=v ( s )不变时,若α max 由 40 °减小到 20 °,则凸轮尺寸会 。
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