USB Disk Authentication - Configure a USB device to act as a "key" to view encrypted information (it must be plugged into the system for access).

盘认证-配置一个USB设备作为一个“钥匙”来查看加密的信息(必须作准入制度堵塞)。

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To improve the rice vertical disk seed sowing device function, find out affect sow key factor. According to the country GB-6973-86to measures the sowing seed function.

为了改善水稻垂直圆盘气吸式排种器的排种性能，找出影响其排种性能的关键因素，按照国标GB-6973-86《单粒（精密）播种机试验方法》中排种指标的计算方法来衡量排种性能。

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