an Australia animal like a small bear with grey fur which lives in trees and eats leaves: ____
下列各组词语中没有错别字的一项是( )
(Ⅰ)证明:CQ∥平面PAB;
(Ⅱ)若平面PAD⊥底面ABCD,求直线PD与平面AQC所成角的正弦值.