Cấp nước & Phân phốiCâu 50 / 360
What does an air gap physically prevent that a mechanical check-based device relies on internal parts to prevent?
a.Excessive velocity
b.Any backflow, because there is no physical path for water to travel backward across the gap
c.Thermal expansion
d.Pipe corrosion
Giải thích
An air gap creates a physical break in the piping so water has no continuous path to flow backward, preventing both back-siphonage and backpressure without moving parts. It does not control velocity, thermal expansion, or corrosion, which are separate concerns.
Trích dẫn luật: 2022 California Plumbing Code (CPC) §603.0Luyện miễn phí toàn bộ 360 câu hỏi — không cần đăng ký.
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