1.

_ According to six-tenths-factor rule, if the cost of a given unit at one capacity is known, then the cost of similar unit with '' times the capacity of the first unit is approximately equal to __________ times the cost of the initial unit.$?

A. N
B. N0.6
C. N0.4
D. ‚Äö√ √∂n
Answer» C. N0.4


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