单项选择题
A.horizontal axis B.crankshaft C.vertical axis D.camshaft
Prior to running the hydraulic pump, examine the system...
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.
A.neutral B.end C.opening D.closure
Anchor（） are used in some installations where the cable...
单项选择题Anchor（） are used in some installations where the cable lifter rotates about a vertical axis.
A.windlasses B.drums C.capstans D.warp ends
Grease the roller bearings with HPgun In the sentence “...
单项选择题Grease the roller bearings with HPgun In the sentence “HP” means （）.
A.horse power B.high pressure compressor C.hand pump D.high pressure
