单选题The connecting rob is fitted between the crosshead and the crankshaftIt transmits the firing force, and together with the crankshaft convert the （） motion to a （） motion.Arotary；reciprocatingBup and down；fore and aftCfore and aft；up and downDup and down；rotary
单选题
The connecting rob is fitted between the crosshead and the crankshaftIt transmits the firing force, and together with the crankshaft convert the （） motion to a （） motion.
A
rotary；reciprocating
B
up and down；fore and aft
C
fore and aft；up and down
D
up and down；rotary
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