...0年代，控制阀以阀体形状为球形的球形阀(Ballvalve)为主，同时期以V形缺口(V-notch)的单座(Single-ported)和双座(Double-ported)控制阀相继问世。
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double ported slide valve 双口滑阀
double ported valve 双口阀
double ported vale 双口阀
double ported vingve 双口阀
double ported slide vingve 双口滑阀
double e ported valve 双口阀
double e ported slide valve 双口滑阀
The dual-ported RAM is a kind of special memory, and the bus data share between double high-speed microprocessors is carried out by using it.
双端口ram是一种特殊的数据存储芯片，利用双端口ram可以实现双高速单片机总线方式的数据共享。
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