单选题Two rams of the hydraulic gear are linked at their outer ends to （） by a crosshead and swivel block.Athe piston rodBthe tiller armCthe connecting rodDthe rudder
单选题
Two rams of the hydraulic gear are linked at their outer ends to （） by a crosshead and swivel block.
A
the piston rod
B
the tiller arm
C
the connecting rod
D
the rudder
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