单项选择题

‌ORB特征的描述子是‌

A． FAST
B． SIFT
C． Oriented FAST
D． BRIEF
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单项选择题
幼儿教师对家长描述学前儿童行为时既要作事实性描述，也应作情感性描述。
A.正确
B.错误
单项选择题
If a consumer maximizes a utility function subject to a budget constraint and has strictly convex preferences, then his behavior will necessarily satisfy the weak axiom of revealed preference and the strong axiom of revealed preference.
A．对
B．错
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