The tackle that raises and lowers the boom is().
A、the cargo fall
B、The cargo hoisting wire rope
C、the topping lift
D、the cargo whip
A、the cargo fall
B、The cargo hoisting wire rope
C、the topping lift
D、the cargo whip
A、blocks have been overhauled B、hauling parts of two tackles are attached C、hauling part leads through the movable block D、hauling part leads through the standing block
A、blocks have been overhauled B、hauling parts of two tackles are attached C、hauling part leads through the movable block D、hauling part leads through the standing block
A、blocks have been overhauled B、hauling parts of two tackles are attached C、hauling part leads through the movable block D、hauling part leads through the standing block
A、A.all the fall except the hauling part B、B.the hook that engages the weight to be moved C、C.that part to which power is applied D、D.that part of the falls made fast to one of the blocks