This is the first time that a woman ________ to the post of sales director in this company. ( )
A:has appointed
B:had been appointed
C:has been appointed
D:had appointed
如图所示,上下开口、内壁光滑的铜管P和塑料管Q竖直放置,小磁块先后在两管中从相同高度处由静止释放,并落至底部,则小磁块( )
若舍郑以为东道主,____,____,君亦无所害。(《烛之武退秦师》)
《声声慢》作者____,李清照,号____,宋代____派著名女词人。
完成下列关于绿色植物的叶片结构及功能的概念图.
①____②____ ③____ ④____⑤____.