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单选题
Some pumps use packing as sealing glandThe gland should be （）.
A
slack enough to allow slight leakage of fluid
B
slightly clocked
C
brought up tight so as not to allow any leakage
D
fitted with a relief valve
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单选题Some vessels are equipped with a water lubricated stern robeWhen at sea, operating under normal conditions, the water service valve from the ships saltwater system to the bearing should be （）.A
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单选题In the process of the shafting management, special attention should be paid to（）A
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单选题_____A
The man can use her computer.B
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