A:Get up early.
B:Help me.
C:Clean her room up.
读“地壳物质循环简略图”(如图),回答下列问题.
It is .
已知α,β是两个不同的平面,a,b是两条不同直线,给出条件:①α∩β=∅;②a⊥α,a⊥β;③a∥α,b∥α,b⊂β.上述条件中能推出平面α∥平面β的是____ .(填写序号).