n. centerboard
misc. dagger board ; dagger plate
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把石油工业中多项专用技术与水利工程的实际需要相结合，创造了水力插板技术。
Integrating the many specific techniques of petroleum industry with the actual need of the hydraulic engineering, the technique of hydraulic panel was created.
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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