To encourage water consumption at least one water dispenser must be located with

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试卷: WELL AP模拟题英文A卷[查看]
To encourage water consumption at least one water dispenser must be located within how many meters of all parts of regularly occupied floor space with a minimum of one per floor?
为了鼓励喝饮用水，规定占地面积的所有部分的多少米内至少有一个饮水机，且每层至少有一个？
A: 50m
B: 40m
C: 20m
D: 30m

参考答案: D

本题解释:
正确答案：D