【单选题】假定有两个国家A与B,生产两种产品X与Y。A国生产X产品有绝对优势的条件是( )
【单选题】—————Good evening. Huangshan Hotel. —————Good evening. ______________?
A.
Do you still have a room for tonight
B.
What would you like, please
C.
Is there anything I can do for you
D.
Who is that speaking, please
【简答题】--Good evening. I _____to see Mary. --Oh, good evening. I'm sorry, but she is not in. A) came B) come C) have come D) had come
【单选题】--Good evening. I __________ to see Mary. --Oh, good evening. I'm sorry, but she is not in.
【单选题】自动变速器的液力变矩器中,其泵轮是被( )驱动的。
【单选题】技术系统中必须具备的要素有三个:( )。这个最小的具有工作能力的可控技术系统称为物场。