设Sn是等差数列{an}的前n项之和，且S6＜S7，S7=S8＞S9，则下列结论

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问题选择题

设S_n是等差数列{a_n}的前n项之和，且S₆＜S₇，S₇=S₈＞S₉，则下列结论中错误的是（　　）

A．d＜0	B．a₈=0
C．S₁₀＞S₆	D．S₇，S₈均为S_n的最大项

答案

答案：C

选择题

I think swimming is _____ hiking.[ ]

A. as interesting than

B. as more interesting as

C. as interesting as

D. more interesting as

问答题

高强螺栓孔成型后如何检查？量规不能通过的孔如何处理？