锚机应能以平均速度不小于（）将1只锚从水深82.5米处拉起至27.5_爱下问搜题

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问题单项选择题

锚机应能以平均速度不小于（）将1只锚从水深82.5米处拉起至27.5米。

A、6米/分钟

B、8米/分钟

C、9米/分钟

D、10米/分钟

答案

参考答案：C

填空题

用方框中所给的词完成短文。

service, popular, survey, best, think, what, play, friendliest, and,delicious

       What do students    1   about fast-food restaurants in our city? We did a   2   of the students in our
school last week and this is   3   we got.
       Most of the students think all fast-food restaurants are good, but the KFC is the    4   in our city. It
has the most creative food and the best   5  . However, McDonald's is the cheapest   6    it has the
funniest picture. It also   7    the interesting music. The most    8   restaurant is the Pizza Hut. It has the
most   9    food and the    10   service.

填空题

二次函数y=2x²-4x-3，当x=______时，有最______值，是______．