【单选题】【消耗次数:1】
设<img src=https://huaweicloudobs.ahjxjy.cn/D2ECFFCF706229EB30F33EB29FCB12C9.png title=DR]]2H_7~0LYR17_4DPZLH1.png alt=DR]]2H_7~0LYR17_4DPZLH1.png/>
一定有最大值
一定有极小值
不一定有极值
一定没有极值
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④  would do
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①  snatch
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