单选题The connecting rod is fitted between the crosshead and the crankshaftI t transmits the firing force, and together with the crankshaft converts 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 rod is fitted between the crosshead and the crankshaftI t transmits the firing force, and together with the crankshaft converts 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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