BtOrientation 常数 | 
            
These constants determine whether the page setup is Landscape or Portrait, and is returned with the Orientation property.
| 
                     常数  | 
                
                     描述  | 
            
|---|---|
| 
                     btLandscape  | 
                
                     Page layout is Landscape.  | 
            
| 
                     btPortrait  | 
                
                     Page layout is Portrait.  | 
            
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