A:2Q1+ Q2 > 4Q3
B:2Q1+Q2<4Q3
C:Q1 +Q2 <Q3
D:Q1+Q2=Q3
(Ⅰ)求证:AB⊥平面PAC;
(Ⅱ)求证:AQ∥平面PCD.
—Do you have any problems if you ______ five minutes to read?—Well, I'm thinking about the new words. There are too many.
下列字形准确无误的一项是 ( )