往醒发室送盘时,应先平行(),以便先入先出、先烤。
A、从上往下入架
B、从下往上入架
C、从中间入架
D、上下轮流入架
参考答案:A
--- Shall I give you a hand as your case is so heavy?
----Thank you._____.
A.Of course you can
B.It’s up to you.
C.If you can
D.It couldn’t be better.
试述古典经济学的主要贡献。