真空板是目前已知绝缘材料中最好的。
And a panel encasing a vacuum is one of the best insulators known.
主要产品有：木箱、卡板、真空袋等系列包装产品。
The main products are: wooden box, card board, vacuum bag etc. packaging products.
CC Q型气动超高真空插板阀用于接通或切断真空管路中的气流。
It is used to put through or cut off the air passage in vacuum pipeline.
CC Q型气动超高真空插板阀用于接通或切断真空管路中的气流。
It is used to put through or cut off the air passage in vacuum pipeline.
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