All of the following statements are true EXCEPT:
A. drive shafts can be aluminum, steel, carbon fiber bonded to aluminum yokes, or composite that is pultruded over an aluminum tube.
B. most steel drive shafts are shorter than 60" to 65".
C. short steel shafts use a center support bearing.
D. aluminum drive shafts can be 85" to 90" because aluminum has a higher "critical speed."
Answer: C
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