单项选择题
A.the tiller arms
B.the swivel blocks
C.hunting gears
D.the rams
单项选择题 Anchor capstans are used in some installation where the cable lifter rotates about a （）.
单项选择题 Prior to running the hydraulic pump, examine the system carefully and ensure that the lever of control valves is in （） position.
单项选择题 Anchor（） are used in some installations where the cable lifter rotates about a vertical axis.