50.What is the formula of the most economical relation between D and L? a) length = 0.6 * diameter b) length = 0.5 / diameter c) length = 0.6 / diameter d) length = 0.63 * diameter
50.What is the formula of the most economical relation between D and L? a) length = 0.6 * diameter b) length = 0.5 / diameter c) length = 0.6 / diameter d) length = 0.63 * diameter
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