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更多“T echnological inventions is one major factor that account s for the change of cultures（）”相关的问题
of member CD at C end is: 
A、1/4
B、4/13
C、3/16
D、2/7
A、when the first country can only produce the first good and the second country can only produce the second good
B、when the first country can produce both goods, but can only produce the second good at great cost, and the second country can produce both goods, but can only produce the first good at great cost
C、when the first country is better at producing both goods and the second country is worse at producing both goods
D、Two countries could gain from trading two goods under all of the above conditions.
B、丝网印刷可按版式,印机品种，油墨性质及承印物类型分类
C、按丝网印刷方式分为平面丝网印刷和曲面丝网印刷
D、按丝网印刷承印物可分为纸类印刷，陶瓷印刷等
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