亚洲图片欧美一区_中文字幕免费一区_国产欧美一区二区三区网站 _久久一区二区三区国产精品_欧美韩国日本综合_国产片一区二区三区_国产精品另类一区_亚洲成国产人片在线观看_久久久亚洲精品一区二区三区_国产网站一区二区

Photoelectricity protector, also is called the safe light curtain, the security light grating, is through launch infrared, has the protection light grating, when the light grating is interdicted, the device sends out the interrupting signal, to control which has the potential hazard mechanical devic...More