【单选题】【消耗次数：1】
如图3所示TTL门电路，当时，F的状态为（）
①
②
③
F=AB
参考答案：
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【单选题】
哪个是石大在线官方微信？
①
<imgdata-url="doc/a@8CE0393037E3C3D943041E145EEB4761.jpg"data-preview_url_ueditor="doc/a@8CE0393037E3C3D943041E145EEB4761.jpg"src="http://121.251.253.213/doc/a@8CE0393037E3C3D943041E145EEB4761.jpg/download?time=636154229957298238&token=C9C2E01C18DF968BF18A561EE6D28018&filename=jpg"/>
②
<imgdata-url="doc/a@49F92E671A48830B9035FC09CA669E29.png"data-preview_url_ueditor="doc/a@49F92E671A48830B9035FC09CA669E29.png"src="http://121.251.253.213/doc/a@49F92E671A48830B9035FC09CA669E29.png/download?time=636154243790934535&token=966B0922A385F1CAAF1A0F74F8145369&filename=png"/>
③
<imgdata-url="doc/a@601D71E67089BFF64E8F11762FB6EBBF.jpg"data-preview_url_ueditor="doc/a@601D71E67089BFF64E8F11762FB6EBBF.jpg"src="http://121.251.253.213/doc/a@601D71E67089BFF64E8F11762FB6EBBF.jpg/download?time=636154230245430744&token=2E24D661642E464AF075DA971E067A53&filename=jpg"/>
④
<imgdata-url="doc/a@AEBD86CC1CAACA042E6DD48E76062F19.jpg"data-preview_url_ueditor="doc/a@AEBD86CC1CAACA042E6DD48E76062F19.jpg"src="http://121.251.253.213/doc/a@AEBD86CC1CAACA042E6DD48E76062F19.jpg/download?time=636154230315474867&token=33D00E2D131F7B94C02F6DED613A1E2B&filename=jpg"/>