不透明度测试仪：量度纸张不透明度并以百分率表示的仪器。

Opacimeter: Instrument for measuring the opacity of paper and expressed it as a percentage.

youdao

不透明度测试仪：量度纸张不透明度并以百分率表示的仪器。

Opacimeter: Instrument for measuring the opacity of paper and expressed it as a percentage.

youdao