上课把女同桌内裤摸湿,一线高清视频在线观看www国产,色综合伊人色综合网站下载,男人边吃奶摸下边免费视频,精品综合久久久久久蜜月

It is used to determine the whiteness and optical properties of textiles, silk, paper, paint, cotton, chemical fiber, ceramic building materials, and daily chemical materials.

It is used to evaluate the color fastness of textile, printing and dyeing, clothing, printing, papermaking, paint and other industries and the evaluation of the degree of different spectrum and the same color.

It is used to measure various fabric samples. Due to the fiber capillary effect, the test solution in the constant temperature bath is sucked up to a certain height to evaluate the water absorption and air permeability of the fabric.

A new formaldehyde quantitative measuring instrument developed in accordance with the national standard method. It is widely used in the rapid quantitative determination of formaldehyde in textiles.

A new formaldehyde quantitative measuring instrument developed according to the national standard method is widely used in the rapid quantitative determination of formaldehyde in textiles.

JG320 series water bath constant temperature oscillator is a kind of biochemical instrument that combines temperature controllable constant temperature water bath and oscillator. It is mainly used in various universitie...

The retroreflective sign measuring instrument is also called the retroreflective coefficient measuring (determining) instrument for reflective school uniforms in primary and secondary schools. It is a special instrument...

It is used to determine the whiteness and optical properties of textiles, silk, paper, paint, cotton, chemical fiber, ceramic building materials, and daily chemical materials.