Water pump noise is a howling noise

来源: xxhhwxc 于 2009-05-21 09:36:19 [] [旧帖] [给我悄悄话] 阅读数 : (29 bytes)
回答: Use a sethoscope to listen to noise 由 internuts 于 2009-05-20 18:20:42

Which should be easy to tell.

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