capacity-head curve

head curve

head curve of pump

critical envelope curve

Current’s envelope curve

dynamic envelope curve

Envelope Curve

Envelope Curve Formula

Envelope curve of clipping line

outside envelope curve

Outside envelope curve of family circles of the presses hoop

the envelope curve

curve-curve intersection

transition curve；easement curve；spiral transition curve

hammer head [= hammer head shark]

head to head

head to head configuration

head to head structure

head wind [= head sea]