国产三级做爰在线播放-亚洲精品永久免费-最新午夜福利视频理论片免费在线观看-一 级做人爱全视频在线看-免费精品91香蕉国产线-日韩一区二区三区在线视频

■ Gallium for the IIIA group elements, atomic weight 69.72.Gallium soft, light blue. Melting point of 29.78 ℃. Boiling point 2403 ℃. With non-toxic, non-volatile,non-flammable,non-explosive.It is an important element of doped silicon.
■ ≤ 2% light decay is within the detection range, can be regarded as no decay.
■  Specifications