单项选择题
A.up and down；reciprocating B.up and down；rotating C.back and forth；reciprocating D.back and forth；rotating
The connecting rob is fitted between the crosshead and ...
单项选择题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
The （） of the semi-built method of the construction cra...
单项选择题The （） of the semi-built method of the construction crankshaft is that by making the two webs and crankpin from a single forging the grain flow in the steel follows the web round into the crankpin and back down the other web.
A.advantages B.disadvantages C.power advantages D.power disadvantages
Today, crankshafts for large 2-stroke crosshead engines...
单项选择题Today, crankshafts for large 2-stroke crosshead engines are of the （）type.
A.semi-built B.built-up C.solid forged D.individual forged
