设有以下命题:①<img src="/lqwvjeImg/2f/2f34079c20471745900bb2992bda90f0.png"style="width:67px;height:29px;">,则<img src="/lqwvjeImg/54/548f752c2d8e36689c8d118e6e8444c5.png"style="width:39px;height:45px;">必收敛 ②<img src="/lqwvjeImg/54/548f752c2d8e36689c8d118e6e8444c5.png"style="width:39px;height:45px;">收敛,则<img src="/lqwvjeImg/17/179fe9fc552df031b14e035166ac37dc.png"style="width:63px;height:45px;">收敛③<img src="/lqwvjeImg/de/deb918dfef8edff9c10c86f70b44083a.png"style="width:76px;height:45px;">,则<img src="/lqwvjeImg/54/548f752c2d8e36689c8d118e6e8444c5.png"style="width:39px;height:45px;">发散 ④<img src="/lqwvjeImg/63/63385cc6e35965719af9b8b3acf8e029.png"style="width:77px;height:45px;">收敛,则<img src="/lqwvjeImg/54/548f752c2d8e36689c8d118e6e8444c5.png"style="width:39px;height:45px;">、<img src="/lqwvjeImg/e3/e31c59e1fda7d277e47177ac9fd2903c.png"style="width:37px;height:45px;">都收敛,则以上命题正确的是( ).<br>·①②<br>·②③<br>·③④<br>·①④