middle cover plate的意思|示意

The performance of the box-type solar collector was investigated experimentally, the cover of which is a high-vacuum plane glass plate with a middle narrow slot.

用窄缝高真空平面玻璃作普通箱式太阳灶的透明盖板，对箱式太阳灶的集热性能进行了实验研究。

The utility model discloses a new shaping machine for various sandwich foods, comprising a cover plate, an upper mold, a middle mold, a lower mold, etc.

本实用新型公开了一种新的多种食品夹心成型器，由盖板、上模块、中模块、下模块等部件组成。