正确答案: B

packing

题目：Sealing in pump shaft is achieved by means of the ( ).

解析：B

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举一反三的答案和解析：

[单选题]“ Keep ________ to the beacon,” said the pilot

straight

[单选题]锅炉水位计中水位始终静止不动，说明_________堵塞。

A和B

[单选题]软组织损伤早期可用()方法止血

冰敷