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>


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