国产精品国产三级国产在线观看,99精品高清视频一区二区,国产亚洲精品bt天堂,蜜桃avav在线,国产91视频,91精选视频,国产精品第一页爽爽影院

Properties: Industrial magnesium sulfate generally refers to heptahydrate. It is colorless fine needle-like or inclined columnar crystal. It is odorless and bitter. Packaging: plastic woven bag lined with polyethylene film bag, net weight 25 kg/bag; Large packaging bag, net weight 1000 kg/1250 kg/1350 kg/bag.