磁力传动可变孔径式流量计
magnetic transmission variable aperture flow meter
可变孔径变焦距镜头
variable aperture zoom lens
可变孔径法
variable aperture technique
Butylacralate
可变孔径膜
Variable-pore-size membrane
可变孔口流量计
variable orifice (flow) meter
可变孔口式水果分级机
variable hole fruit grader
4孔变角氧枪
Variable Angle 4-hole Oxygen Lance
被砾石与地层砂混合物充填的射孔孔道
gravelsand filled perforation tunnel
变孔调节阀
variable-orifice damper valve
变孔距多孔同段爆破
variable distance multi-hole simultaneous blasting