The source of the starting material need not be identified, but may be requested.

起始原料的来源通常无需说明，但有时会要。

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In the case of a single failure source, the failure source subdevice is identified;

在单一故障源诊断中，可以确定故障源；

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In the case of a single failure source, the failure source subdevice is identified;

在单一故障源诊断中，可以确定故障源；

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