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【单选题】
According to the product life cycle model, comparative advantageA.
may move from one country to another as a product matures.
B.
always stays in the country where a product is invented.
C.
in agricultural or homogeneous manufactured goods is determined by the stage of the life cycle these products are in.
D.
Both A and
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【简答题】空间两力偶等效的条件是 。
【判断题】Construction can be divided into two types : endocentric construction and exocentric construction.
A.
正确
B.
错误
【判断题】Construction can be divided into two types: endocentric construction and exocentric construction.
A.
正确
B.
错误
【简答题】请为头孢克洛的化学结构式中各个原子进行编号,并书写其化学名称。