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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(cè)試鏇塞2號(hào)流出，則2號(hào)球閥有點(diǎn)泄漏，但是1號(hào)止廻閥密封緊密。