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【单选题】
TTL与非门带同类型门的个数为N，其低电平输入电流为1.5mA，高电平输入电流为10μA，最大灌电流为15μA，最大拉电流为400μA，选择N的值。A.
N=5
B.
N=10
C.
N=15
D.
N=20
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