当变幅时，指针指示出各种幅度下的额定起重量。
When amplitude varies, the pointer indicates the rated weight under various ranges.
当变幅时，指针指示出各种幅度下的额定起重量。
When the amplitude, the pointer indicates a variety of rated lifting capacity.
采集不同类型，不同额定起重量起重机一段时间内相应起重量的工作次数数据，以模拟出危险点处相应的载荷谱。
Load spectrum of danger points was simulated by collecting the working frequency of different types of cranes in a period time.
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