单项选择题

复制命令中“模式”参数用来表示选择多个还是一个复制对象，默认情况下为多个对象模式。
A、正确
B、错误

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A competitive strategy may be defined as a long-term plan of action that a company devises towards achieving a _______ over its competitors after examining the strengths and weaknesses of the latter and comparing them to its own.

A．niche market
B．higher market share
C．stronger customer loyalty
D．competitive advantage

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随高度升高，气温的降低率称为大气垂直递减率（Γ=-dT/dz），对于逆温气层的大气垂直递减率，有什么特点
A、Γ> 0
B、Γ= 0
C、Γ< 0
D、Γ≥0