双拓补式准直器
dual copy-supplement collimator
保偏双光纤准直器
Polarization maintaining dual fiber collimator
polarization-maintaining dual fiber collimator
开口双直孔力敏元件
double straight open bore force-sensible element
双定位器准直线
locator-dual collimating line
裹胶变筛孔筛面
Rubber-coated with hole-varied screen mesh