AcRxObject：很少重写的函数
自定义类很少重写以下函数： virtual AcRxObject*
clone() const;
virtual Acad::ErrorStatus
copyFrom(const AcRxObject* pSrc);
// Do not override; AcDbObject behavior is already accounted for.
//
virtual HRESULT __stdcall
QueryInterface ( REFIID riid,
void ** ppvObject );
virtual ULONG __stdcall
AddRef();
virtual ULONG __stdcall
Release();
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