For a disk to be readable, the session must be "closed."
要使盘可读，就必须“关闭”段。
A type of quick-opening valve whose orifice is opened and closed by a disk that pivots on a shaft in the throat of the valve.
一种快开式阀门，其孔口的开启和关闭靠装在阀门颈部枢轴上的圆盘。
The Company closed the main supply monitoring, surveillance cameras, monitoring equipment, hard disk recorders, network cameras, smart ball, ball speed, infrared cameras, micro-cameras and so on.
本公司主要供应闭路监控，监控摄像机，监控器材，硬盘录像机，网络摄像机，智能球，高速球，红外摄像机，微型摄像机等。
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