当你想用一个子用例多个负载，一个新的集电极负载需要用在LOAD卡创建的。
When you want to apply multiple loads in a subcase, a new load collector needs to be created with the LOAD card.
集电极开路(晶体管)输出负载可容纳高达100毫安的电流。
An open collector (transistor) output accommodates loads up to 100 mA.
集电极开路(晶体管)输出负载可容纳高达100毫安的电流。
An open collector (transistor) output accommodates loads up to 100 mA.
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