If an operating bilge pump is developing good vacuum, but is unable to discharge any water, which of the following problems is the most probable cause?（）<br>A:The wearing rings are excessively worn<br>B:The suction strainer is clogged<br>C:The discharge valve is clogged<br>D:The shaft is worn

If an operating bilge pump is developing good vacuum, but is unable to discharge any water, which of the following problems is the most probable cause?（）
A:The wearing rings are excessively worn
B:The suction strainer is clogged
C:The discharge valve is clogged
D:The shaft is worn

出自：海船船员证

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