1.

What is the logarithmic mean of r1 and r2 ?

A. <img src="/_files/images/chemical-engineering/heat-transfer/233-14-1.png">
B. <img src="/_files/images/chemical-engineering/heat-transfer/233-14-2.png">
C. <img src="/_files/images/chemical-engineering/heat-transfer/233-14-3.png">
D. <img src="/_files/images/chemical-engineering/heat-transfer/233-14-4.png">
Answer» B. <img src="/_files/images/chemical-engineering/heat-transfer/233-14-2.png">


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