给玻片标本染色时,最合理的操作是( )
A:先滴加染液,再盖盖玻片
B:把标本放入染液中浸泡
C:在盖玻片上滴染液
D:在玻片的一侧滴染液,在另﹣侧用吸水纸吸引
我会仿
吵吵嚷嚷 ____ ____ 打扫打扫 ____ ____
左顾右盼____ ____ 气喘吁吁 ____ ____
The headmaster introduced ______ to the German visitors before the welcome party.
如图,已知∠ABC=180°﹣∠A,BD⊥CD于D,EF⊥CD于F.
(1)求证:AD∥BC;
(2)若∠1=36°,求∠2的度数.