单项选择题
A.be less than B.be larger than C.be as large as D.not be so large as
The position of the piston parts in relation to each ot...
单项选择题The position of the piston parts in relation to each other is secured by means of （） and a dowel pin in the crown.
A.bosses B.through bolts C.machine-turned recesses D.long studs
单项选择题The position of the piston parts in relation to each other is secured by means of （） in the crown.
A.a mark B.a bolt C.a dowel pin D.a measuring tool
The position of the interface between oil and water wit...
单项选择题The position of the interface between oil and water within the centrifuge is achieved by the use of （）.
A.gravity disc B.centrifugal bowl C.a stack of discs D.main sealing ring
