Some pumps use packing as sealing glandThe gland should be （）.<br>A:slack enough to allow slight leakage of fluid<br>B:slightly clocked<br>C:brought up tight so as not to allow any leakage<br>D:fitted with a relief valve

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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