皮囊式采样器的特性是，入水后皮囊内外静水压力基本可以随遇平衡，以保持水样按（）流速流入囊内。_水文勘测初级工_全学科试题题库

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皮囊式采样器的特性是，入水后皮囊内外静水压力基本可以随遇平衡，以保持水样按（）流速流入囊内。
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