Cov khoom lag luam

Qhov muag rub phaj sib txuas yog qhov kho vajtse tsim kho kom txuas thiab txhim kho cov qauv. Nws feem ntau muaj ib lossis ntau lub qhov muag uas tuaj yeem tiv thaiv nro thiab nce cov khoom hnyav.

Cov hlua hlau yog tsuas yog siv rau kev kho lossis txuas qhov kawg ntawm kev sib tw hlau hlau hauv GB 8918-2006 xws li cranes, kev thauj mus los, nkoj thiab kev lag luam.