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单项选择题

According to Michael Porter, what are the two main factors which can lead to a significant competitive advantage? 
A、Low costs and differentiated products.
B、Bad product performance and low switching costs.
C、High costs and differentiated products.
D、Good product quality and high substitute availability.

问答题

函数在单连通区域G内解析，C为G内的简单闭合围道，则积分的值（围道积分为逆时针方向一周）为
A、 一定为 0
B、一定不为 0
C、一定不存在
D、 可能不为 0
E、 可能为 0
F、 可能不存在
G、一定存在
H、可能存在
I、
J、