A.分散潤滑和集中潤滑
B.單獨潤滑和分散潤滑
C.連續(xù)潤滑和集中潤滑
D.間歇潤滑和連續(xù)潤滑

A.焊接連接
B.發(fā)蘭連接
C.伸縮連接

A.1/2～2/3
B.1/2
C.2/3

A.12
B.4
C.6
D.8

A.40
B.50
C.60
D.70