51、3 起重机械是指采用吊钩等起重工具，在间歇、重复的工作方式下，吊起、降低、举起、运输货物的机械设备。Hoisting machinery refers to the mechanical equipment that lifts, lowers or lifts and transports goods by lifting hooks or other lifting appliances in the intermittent and repeated working mode.
51、3 起重机械是指采用吊钩等起重工具，在间歇、重复的工作方式下，吊起、降低、举起、运输货物的机械设备。Hoisting machinery refers to the mechanical equipment that lifts, lowers or lifts and transports goods by lifting hooks or other lifting appliances in the intermittent and repeated working mode.
参考答案和解析
B
相关考题：
An automobile sling is used for ________A.lifting aircraft and helicoptersB.lifting any kinds of cargoC.lifting the heavy boxesD.lifting cars and trucks
To safeguard the operator and other personnel working on or near a hoisting operation, which of the following precautions should be observed?A.Keep a load on the hoist until all personnel are finished workingB.Set the load on a movable dolly when transportation may be neededC.Have one man keep a hand on the load to steady itD.Insure that the lifting gear capacity is not exceeded
Which safety precaution（s）should be observed during crane operations ________．A.Checking for proper lifting from beneath the load during cargo operationsB.Using the proper slings or other lifting devices during cargo operationsC.Relaying communications to port agents on the pier during cargo hoistsD.All of the above
The universal lifting spreader is a lifting device used on ______．A.dockside container cranesB.shipboard container cranesC.straddle trucksD.straddle cranes
Mechanical lifting of air by the upslope slant of the terrain is called ______.A.vertical liftingB.convective liftingC.advective liftingD.topographic lifting
单选题In cargo crane, （） for lifting the load.Aa hoisting motorBa luffing motorCa mooring motorDa slewing motor
单选题重吊杆用于吊大的重件。（）AHeavy derrick is used for lifting large heavy cargo.BDerrick is used for lifting large heavy cargo.CHeavy derrick is used for lifting dry bulk cargo.DDerrick is used for lifting dry bulk cargo.
单选题Any friction fit, tightness or adhesion of the part of any load being lifted should be broken by wedge or tapping and not by increasing the load on the applianceAccording to this sentence, （）Athe lifting appliance can always lift the freight within its rated loadBattention should be paid in order not to break the wedge when lifting cargoCsometimes the lifting work needs other assistance other than the lifting applianceDlifting work should be done with every part fit, tightness or adhesion
单选题To safeguard the operator and other personnel working on or near a hoisting operation which of the following precautions should be observed?（）AKeep a load on the hoist until all personnel are finished workingBSet the load on a movable dolly when transportation may be neededCHave one man keep a hand on the load to steady itDInsure that the lifting gear capacity is not exceeded
单选题A spreader bar is used to（）.Aincrease the lifting capacityBincrease the lifting radiusCprotect the slingsDprotect the upper part of a load
单选题Why does the honest public have to pay higher prices when they go to the shops?AThere is a “shrinkage” in market values.BMany goods are not available.CGoods in many shops lack variety.DThere are many eases of shop-lifting.
单选题Mechanical lifting of air by the upslope slant of the terrain is called（）.Avertical liftingBconvective liftingCadvective liftingDtopographic lifting
判断题起重机械是以间歇、重复的工作方式，通过起重吊钩或其他吊具起升、下降，或升降与运移物料的机械设备。A对B错