The tackle that raises and lowers the boom is().
- Athe cargo fall
- BThe cargo hoisting wire rope
- Cthe topping lift
- Dthe cargo whi
The tackle that raises and lowers the boom is().
1、The part of a fuse that melts and open
The part of a fuse that melts and opens the circuit is made of ().Acopper and antimonyBsteel and babbittCaluminum or beryllium alloyDzinc or an alloy of tin and lead
2、The crane jib is raised and lowered by
The crane jib is raised and lowered by means of ()Aa mooring winchBa hoisting winchCa slewing winchDa luffing winch
3、Prior to lowering the lifeboat,the mos
Prior to lowering the lifeboat,the most important item to check is the().AoarsBsailCboat plugDlife preserver
4、You are inspecting the lower main prec
You are inspecting the lower main precision bearings on a diesel engine.You observe that about half the thin Babbitt linings are of a milky w...
5、The association is()to raising funds t
The association is()to raising funds to help the blind.AconductedBcommittedCconcentratedDconcerned
6、Which tackle arrangement has the LEAST
Which tackle arrangement has the LEAST mechanical advantage().ASingle whipBGun tackleCLuff tackleDTwofold purchase