1. an extended period of underload, a sudden shift to higher workload can have negative effects on efficiency for tasks that require sustained attention.
   在持续了一段时间的低工作强度的工作之后，突然到来的高峰会对一个要求注意力和警觉的工作产生负面的影响。
2. Provided with a kind of winding switching device, the motor runs with the two windings working simultaneously while underloaded, and with the multi circle winding...
   电动机外部采用切换装置,轻载时,两个绕组串联运行;满载时,只用多匝绕组运行。

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