单项选择题
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
单项选择题 Excessively warm water leaving condenser may be caused by（）
单项选择题 （）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.
单项选择题 （） unit is mounted so as to raise and lower the cable from the spurling pipe, which is at the top and center of the chain or cable locker.