“a＞3”是“a＞4”的______条件
“a＞3”如a=3.3，则a不大于4，是“a＞4”那么a一定大于3．
故答案为：必要不充分．
大中河流，当弯曲系数为( )时，可视为弯曲河流。
A．1.1
B．1.2
C．1.3
D．1.4
Speaker A: The native American Craft Exhibit closed this afternoon. Speaker B: ().
A. Oh, no! I’ve wanted to see that for months.
B. Well, why didn’t you take me to see the exhibit before it closed
C. Thank you. When will there be such an exhibit again
D. If I were you, I would have gone to see it.
