 
			 
			MCQOPTIONS
 Saved Bookmarks
				| 1. | When a plane is perpendicular to both the reference planes, its traces are perpendicular to _____________? | 
| A. | xy reference line | 
| B. | lines on horizontal plane | 
| C. | lines on vertical plane | 
| D. | lines on given plane | 
| Answer» B. lines on horizontal plane | |