单选题：如图，已知面ABC上面BCD，AB上BC，BC上CD，且AB=BC=CD，设AD与面ABC所成角为α，AB与面ACD所成

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题目内容：
如图，已知面ABC上面BCD，AB上BC，BC上CD，且AB=BC=CD，设AD与面ABC所成角为α，AB与面ACD所成角为β，则α与β的大小关系为(　　).
HWOCRTEMP_ROC1450 A．α<β
B．α=β
C．α>β
D．无法确定

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