天天舔天天爽_视频日韩_成人网线_天天草草草_免费一级在线观看_色综合色综合色综合色综合

英國 Bentham 
英國BENTHAM公司是生產光電系列產品，其產品種類非常齊全，包括光譜儀、單色儀、光源、探測器等各種儀器。
Bentham Instruments offers over 30 years extensive experience in the manufacture and supply of standard instruments and custom systems for applications involving the study and measurement of light.

Our established customer base ranges from blue chip organisations to highly respected university research departments and we pride ourselves on supplying them with reliable and accurate instrumentation.