MCQOPTIONS
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				| 1. | 
                                    The mathematical value of down comer backup is? | 
                            
| A. | h<sub>c</sub> + h<sub>t</sub>+ h<sub>ad</sub> | 
| B. | h<sub>c</sub> h<sub>t</sub>+ h<sub>ad</sub> | 
| C. | h<sub>c</sub> h<sub>t</sub> h<sub>ad</sub> | 
| D. | h<sub>c</sub> + h<sub>t</sub> | 
| Answer» B. h<sub>c</sub> h<sub>t</sub>+ h<sub>ad</sub> | |