The sealing rings are in four parts and pressed together around the piston rods by means of （）.

时间：2019-04-14 06:31:44 关键词：four,in,and

The sealing rings are in four parts and pressed together around the piston rods by means of （）.

A.nuts

B.bolts

C.coil springs

D.stuffing boxe

答案解析

C

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