wedge friction wheel
科技
wave phase velocity
watt hour meter
water resistant paint
water proof test
waste steam heating
waste heat recovery
warping of section
wall shear stress
wall boundary layer
voltage current characteristic
volt ampere characteristic
viscosity index improver
vibration of plate
vibration of membrane
vibration of bar
vibration isolation material
vertical temperature grade
vertical feed screw
vernier height gage
velocity of slip
velocity of propagation
variation of amplitude
variable speed drive
variable pitch propeller
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