Raws li peb txhua tus paub, txhua tus cranes, chaw nres nkoj cranes thiab engineering cranes yog siv los nyhav khoom hnyav, yog li muaj kev ruaj ntseg haujlwm tseem ceeb heev, yog tias muaj teeb meem nrog kev lag luam, qhov tshwm sim tsis zoo, yog li thaum twg peb siv cov crane peb yuav tsum them xim rau kev khiav hauj lwm kev ruaj ntseg. Nyob rau hauv lub post lag luam peb yuav tsum them sai sai rau ntau cov cai:

1. ua ntej tsav tsheb kom ua tib zoo xyuas cov choj crane crane tiv thaiv kev nyab xeeb thiab siv tau.

2. Ntsuas seb puas muaj ib qho nqaj choj ua crane crane hlau hlua burr phenomenon.

3. Nquag saib xyuas seb txhua hom nyees khawm yog nyob rau qhov zoo, qhov teeb meem loj ntawm cov nqaj crane yog qhov teeb meem ntawm kev tsheb ciav hlau.

4. Cov nqaj crane ua haujlwm seb puas muaj suab nrov.

5. Kev sib txuas ntawm cov hniav sib txuas ua ke, ua tib zoo saib rau cov neeg taug kev, tsis yog nyob hauv cov neeg, cov khoom siv tsheb thauj khoom mus taug kev saum toj, ib tus neeg hauv qab los yog pib lub npuas tib lub choj crane rau kauj tswb lub tswb ua ntej.

6. nqa cov khoom hnyav yuav tsum tsis txhob tshaj, tsis pub yuam kev.