A:白色沉淀为Mg(OH)2
B:在加入NaOH过程中生成沉淀最多为13.6g
C:生成H2体积为5.6L
D:刚加NaOH 溶液就有沉淀生成
下列说法正确的是( )
① The shoes are 20 yuan. ____ A.
② The shoes are 10 yuan. ____ B.
③ The skirt is nice. ____ C.
④ The shoes are expensive. ____ D.
There are 30 classrooms ____________ our school. Mine is _____________ the second floor.