 
			 
			MCQOPTIONS
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				| 1. | If_an_annulus_has_an_inner_diameter_of_d_1_and_an_outer_diameter_of_d_2_then_the_equivalent_diameter_is$ | 
| A. | 2 d<sub> 2 </sub>– d<sub> 1</sub> | 
| B. | d<sub> 2 </sub>– 2 d<sub> 1</sub> | 
| C. | d<sub> 1 </sub>– d<sub> 2 </sub> | 
| D. | d<sub> 2 </sub>– d<sub> 1</sub> | 
| Answer» E. | |