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【单选题】
Describe three types of gains from trades?A.
trades of exchange rates for goods or services, trades of goods or services for property, and trades of gold for textiles
B.
trades of goods or services for goods or services, trades of goods or services for assets, and trades of assets for assets
C.
trades of imports for exports, trades of exports for imports, and trades of natural resources for financial assets
D.
trades of services for goods, trades of currency for services, and trades of one type of currency for another.
E.
trades of current goods for future services, trades of currency for gold, and trades of one type of currency for another
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【单选题】10mg 吗啡的镇痛效果与 100mg 哌替啶相同,说明
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吗啡的效能比哌替啶强 10 倍
B.
哌替啶的效能比吗啡强 10 倍
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吗啡的效价强度比哌替啶强 10 倍
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