空虚
blankness; vacancy; airiness; emptiness; hollowness; vacuity
空虚层
depletion layer
空虚层电容量
depletion-layer capacitance
空虚层晶体管
depletion-layer transistor
空虚层整流
depletion-layer rectification
空虚场效晶体管
depletion field-effect transiontor
空虚区
depletion region
空虚视野近视
empty field myopia
净化空气总管
clean air manifold
净空
headroom
clear space
净空高度
head room; head-room clearance; overhead clearance
净空间
clear space
静止空气粘滞性
viscosity of stationary air
绝对空间
absolute space
绝对真空
absolute vacuum
军事航空管制
military air-traffic control
卡尔真空烘箱
carr oven
开放领空
open skies
开空头支票
kite flying
开空头支票的人
paper hanger