VB Every class has at least one __________?

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VB Every class has at least one __________?
Every class has at least one __________?
a) Method
b) Variable
c) Property
d) All of the above
e) a and c

选e
a是方法,c是属性.
所有的类都有至少一个方法,一个属性.
b可见性,有些控件,例如计时器,是没有的
d以上所有,当然包括b所以是错的.
只能选e
再问： Variable 是变量。
再答：哦。记错了，可见性是Visible。
但不影响结论，这个是绝大多数控件所没有的东西，所以选E

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