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				| 1. | The plane surfaces intersect in a ____________ the line of intersection between two curved surfaces is _________ and between a plane surface and curved surfaces is a _________ | 
| A. | straight line, curve, curve | 
| B. | straight line, straight line, curve | 
| C. | straight line, curve, straight line | 
| D. | curve, curve, curve | 
| Answer» B. straight line, straight line, curve | |