你也可以使用ACTION环境变量来检测设备是否连接或断开, 它的值是"add"和"remove"其中的一个。

You can also use the ACTION environment variable to detect whether the device is being connected or disconnected - ACTION will be either "add" or "remove" respectively.

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设备代理可以在轮流检测的间隔或设备启动后的任何时刻(或两种条件同时满足)查询等待执行的作业，这依赖于所处的环境。

Depending on the environment, the device agent may poll for waiting jobs at a polling interval, or whenever the device is powered on, or both.

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培训课程包括：野外测绘、实验室分析、化验分析、设备检测和校准、环境安全监管以及其他相关学科。

Training includes field mapping, laboratory analysis, assay analysis, test equipment operation and calibration, environmental and safety monitoring, and related subjects.

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