Lifting capacities of derricks vary from three to ten tons. （）A、吊杆的起吊能力为三至十吨不等B、克令吊的起吊能力为三至十吨不等C、他们每24个小时值两次班D、起重机的起吊能力为为三至十吨不等
Lifting capacities of derricks vary from three to ten tons. （）
- A、吊杆的起吊能力为三至十吨不等
- B、克令吊的起吊能力为三至十吨不等
- C、他们每24个小时值两次班
- D、起重机的起吊能力为为三至十吨不等
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船舶离港之前，所有的吊杆必须纵向收放好。（）A、Before leaving the harbour, all derricks must be stowed.B、After leaving the harbour, all derricks must be stowed fore and aft.C、Before leaving the harbour, all derricks must be stowed fore and aft.D、Before leaving the harbour, all heavy derricks must be stowed fore and aft.
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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.
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单选题我们每航次拆卸一次吊杆。（）AWe dismantle the jumbo boom twice a voyage.BWe dismantle the derricks once a voyage.CWe examine the derricks once a voyage.DWe dismantle the heavy derricks once a voyage.
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Generally speaking, suction heads require to be （） for high speed or large capacities than for low speed or small capacities.AgreaterBsmallerCbetterDworse
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Lifting capacities of derricks vary from three to ten tons. （）A吊杆的起吊能力为三至十吨不等B克令吊的起吊能力为三至十吨不等C他们每24个小时值两次班D起重机的起吊能力为为三至十吨不等
单选题Please swing the derricks （）wharf side.AtoBinCatDfor