Some pumps use packing as sealing glandThe gland should be （）.
- Aslack enough to allow slight leakage of fluid
- Bslightly clocked
- Cbrought up tight so as not to allow any leakage
- Dfitted with a relief valve
问题
Some pumps use packing as sealing glan
参考解析：
分类：船舶辅助机械题库
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