【单选题】Small farms and the lack of modern technology have _____ agricultural production.
【单选题】The production possibilities frontier is a
A.
map which shows the frontier beyond which agriculture is unprofitable.
B.
map which shows areas of the world in which capitalist production is now possible.
C.
graph which shows the various combinations of resources that can be used to produce a given level of output.
D.
graph that shows the various combinations of output the economy can possibly produce given the available resources and technology.
【单选题】《旅游法》第五条规定,国家倡导()的旅游方式P102
【判断题】维生素K是脂溶性萘醌类的衍生物,其基本结构为2-甲基-l,4-甲萘醌。( )
【单选题】Small farms and the lack of modern technology have______ agricultural production.
【简答题】天一阁于1561年由明代兵部右侍郎( )主持建造。
【单选题】词的上片“燎沉香,消溽暑”,是从什么方面进行的描写?