单项选择题
（） connected to the moving tiller will bring the floating lever pivot and the lever into line at right angles to the screw shaft axis.
A.A cut-off lever B.A swivel block C.A cross-head D.A driving gear
单项选择题 Two rams of the hydraulic gear are linked at their outer ends to （） by a crosshead and swivel block.
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.
