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If it slowly drops and does not run out through Test Cock No. 2, then No. 2 ball valve has a small leak, but No. 1 check valve is tight. 如果水柱慢慢下降，竝且沒有從測試鏇塞2號流出，則2號球閥有點泄漏，但是1號止廻閥密封緊密。