Q:C#支持多继承吗？
A:不
Q:protected class访问级别如何？
A:允许本类和子类访问
Q:private class变量可以被继承吗？
A:行，但不能被访问，但可以被继承
Q:描述一下protected internal
A:只有派生类型或同一程序集中的类型才能访问该成员。
Q:What does the term immutable mean?
A:The data value may not be changed.  Note: The variable value may be changed, but the original immutable data value was discarded and a new data value was created in memory.
Q:System.String 和System.Text.StringBuilder 的区别？
A:
Q:能将不同类型的数据存在System.Array中吗？
A:不能

Q:System.Array.CopyTo() 和 System.Array.Clone()区别?

A:The Clone() method returns a new array (a shallow copy) object containing all the elements in the original array.  The CopyTo() method copies the elements into another existing array.  Both perform a shallow copy.  A shallow copy means the contents (each array element) contains references to the same object as the elements in the original array.  A deep copy (which neither of these methods performs) would create a new instance of each element's object, resulting in a different, yet identacle object.

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