【单选题】蔬菜嫁接苗嫁接愈合期对温度和光照的要求是( )。
【单选题】(漆酚)是我国特产生漆的主要成分。生漆涂在物体表面,在空气中干燥时会产生黑色漆膜。则漆酚不具备的化学性质是 [ ]
【简答题】黑美人西瓜嫁接苗定植后,如何预防枯萎病?
【单选题】听力原文:The orthodox explanation of where Columbus first landed was carved in textbook stone more than 40 years ago by the dean of Columbus historians, Samuel Elliot Morrison. Morrison declared incontrov...
B.
At the spot where a carved stone was erected to mark the event.
C.
Somewhere in eastern Bahamas.
D.
No consensus has been reached on the event among historians.
【单选题】51下列各处不适合建立地铁车站的为( )