How often must water for human consumption be tested for dissolved metals accord

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试卷: WELL AP模拟题英文B卷[查看]
How often must water for human consumption be tested for dissolved metals according to Part 1 of Feature 36: Water Treatment? 根据条款36水处理第1部分的规定，人类饮用水检测溶解金属的频率是？
A: Once a year. 每年一次
B: Every 3 months. 每三个月一次
C: Every 6 months. 每六个月一次
D: Never. 从来不需要

参考答案: B

本题解释:
正确答案：B