【单选题】In an 8 hour day, Andy can produce either 8 loaves or 24 cakes; Rolfe can produce either 24 loaves or 24 cakes. Andy and Rolfe ________.
A.
can gain from exchange if Andy specializes in cake production and Rolfe specializes in bread production
B.
can gain from exchange if Andy specializes in bread production and Rolfe specializes in cake production.
C.
cannot gain from exchange.
D.
can exchange but only Rolfe will gain.
【单选题】关于吗啡镇痛作用机制的描述,正确的是()
【单选题】In an hour, John can produce 20 loaves of bread or 20 cakes while Joe can produce 30 loaves of bread or 15 cakes. The gains from trade will be maximized if John produces _______ and Joe produces _____...
A.
only bread; only cakes
B.
only cakes; only bread
C.
both cakes and bread; only bread
D.
only cakes; both bread and cakes
【单选题】以下哪个是通电延时时间 继电器的图形符号。
【判断题】面向对象的特点主要可以概括为封装性、继承性和重载性
【单选题】关于吗啡镇痛作用机制的描述,正确的是( )
【单选题】处于气温较低环境时,人体散热量占总散热量比例最大的散热方式是