Instead, they are characteristics of a "logical pen."
代替的是，它们是“逻辑画笔”的特征。
This circuit may make a tri-state logic pen or is installed in the multimeter and the digital logical experiment box.
该电路可做成三态逻辑笔或装置在万用表、数字逻辑实验箱中使用。
This circuit may make a tri-state logic pen or is installed in the multimeter and the digital logical experiment box.
该电路可做成三态逻辑笔或装置在万用表、数字逻辑实验箱中使用。
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