8 theem
Kev Ua Hauj Lwm Qib Xov Xwm:
A1-A4 lub teeb qib xws li: kev teeb tsa, kev txuag ntawm hluav taws xob nqaj-hom cranes.
A4-A6 Intermediate: Muag cov laib-thiab-choj cranes rau cov haujlwm cob qhia
A6-A7 hnyav qib xws li: Hnyav ua haujlwm kav muag muag Hook choj crane
A8 phaus nyhav xws li: Choj hlau txuas ntawm Crane, nruam ua haujlwm ntawm electromagnetic, grab choj crane
