12×4=23×3=31×2=12×40=23×30=31×20=120×4=2_爱下问搜题

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问题解答题

12×4=	23×3=	31×2=	12×40=
23×30=	31×20=	120×4=	230×3=
310×2=	120×40=	230×30=	310×20=

答案

12×4=48	23×3=69	31×2=62	12×40=480
23×30=690	31×20=620	120×4=480	230×3=690
310×2=620	120×40=4800	230×30=6900	310×20=6200

选择题

In Dali Mr Green was so struck by the beauty of _____nature that he stayed for _____third week.

A．the ; the

B．the ; a

C．不填；the

D．不填；a

问答题简答题

酶分子的哪些侧链可以被修饰？