400-600-1123
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答案：
E
如图所示
要求表面积为多少，需要知道桶的周长为多少，x为多少
条件一只告诉了x，不充分；条件二告诉了桶高1米，无关条件，不充分。
联立，同样无法求出桶的周长，所以也就求不出表面积，因此选E
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