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【单选题】
5-1.饮用水水源地、省（自治区、直辖市）交界断面中需要重点控制的监测断面采样频次为（ ）.A.
每月至少一次
B.
每季度一次
C.
每年一次
D.
逢单月一次
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A.
outcome
B.
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C.
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D.
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A.
capability
B.
efficiency
C.
sufficiency
D.
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A.
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B.
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