The gland plate comprises a core layer and a top and a bottom sandwiching layers, the composition of which is selected for the desired purpose;

密封板包括芯部层和顶 部和底部夹置层，其组分根据所需目的而选择；

youdao

OPC Standard is selected as upper layer interface in contrast with EPA Specification as bottom layer interface in EPA Data Server based on OPC.

基于OPC标准的EPA数据服务器选择OPC标准作为上层接口，选择EPA规范作为底层接口。

youdao

OPC Standard is selected as upper layer interface in contrast with EPA Specification as bottom layer interface in EPA Data Server based on OPC.

基于OPC标准的EPA数据服务器选择OPC标准作为上层接口，选择EPA规范作为底层接口。

youdao