The internal force of a material, which tends to resist deformation when subjected to external forces, is known as （）.

A.increase discharge pressure
B.decrease pump capacity
C.decrease pump cavitation
D.decrease reaction ring clearance

A.too much superheat
B.insufficient superheat
C.suction pressure too low
D.excessive refrigerant returning to the compressor

A.Needle
B.Tapered roller
C.Roller
D.Ball