已知两不共线向量$\overrightarrow{a}=\left(\cos \alpha ,\sin \alpha \right),\overrightarrow{b}=\left(\cos \beta ,\sin \beta \right)$,则下列说法不正确的是 （　　）

如图所示，直线AB、CD相交于点O，且∠AOD+∠BOC=110°，则∠AOC的度数是（    ）

完形填空。 
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