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【单选题】
主动脉瓣狭窄最主要的特征:A.
心脏下扩大极明显
B.
胸骨左缘第3、4肋间有舒高调递减型杂音
C.
周围血管征
D.
Austin Flint杂音
E.
主动脉瓣区喷射性杂音伴S2减弱或消失
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皮皮学刷刷变学霸
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【单选题】用图解法解线性规划时,以下几种情况中不可能出现的是( )
A.
可行域（约束集合）有界，无有限最优解（或称无解界）
B.
可行域（约束集合）无界，有唯一最优解
C.
可行域（约束集合）是空集，无可行解
D.
可行域（约束集合）有界，有多重最优解
【简答题】Section A Are you really in love? How do yon know the difference between love and infatuation? This is often difficult to determine, for there are no set rules surrounding the definitions of love or i...
【单选题】The product life cycle suggests that
A.
Often the same firms that pioneer a product in their home markets undertake FDI to produce a product for consumption in foreign markets
B.
When a firm that is part of an oligopolistic industry expands into a foreign market, other firms in the industry will be compelled to make similar investments
C.
Combining location-specific assets or resource endowments and the firm's own unique assets often requires FDI
D.
Impediments to the sale of know-how increase the profitability of FDI relative to licensing
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