若，，则的夹角为（）. A．30° B．60° �

若，，则的夹角为（　　）.

A．30° B．60° C．120° D．150°

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若， ，则 的夹角为（ ）. A．30° B．60° �

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若，，则的夹角为（）. A．30° B．60° �