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【单选题】
类封装了信息和行为，是面向对象的重要组成部分。在系统设计过程中，类可以分为实体类、边界类和控制类。下面用例描述中属于控制类的是（ ）。A.
身份验证
B.
用户
C.
通信协议
D.
窗口
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A.
TRUE
B.
FALSE
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【单选题】It is implied that______.
A.
there are only three body shapes
B.
the ectomorphs enjoy most food
C.
Catherine Collins is an expert in body shape
D.
People who enjoy most food have trouble in losing weight
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