大断面球铁铸件
wheel of airport boarding bridge
双积分球－光电管
Double integrating spheres-photodiode
双沟球轴承套圈
the double-groove ball bearing
双沟道球轴承
double groove ball bearing
双层球面网壳
double-layer reticulated spherical dome
double-layer reticulated spherical shell
Double-layer Reticulated Dome
double-layer spherical reticulated shell
double-layer spherical latticed shell
double layer spherical reticulated shell
双半套圈角接触球轴承
angular contact ball bearing with two-piece ring
双积分球系统
Double-integrating-sphere system
Double integrating sphere system