------------- Secondary (high) school graduation certificate
Tasks
--------- Fill hollows and remove spots on freshly poured cement
Operate power vibrators to compact concrete
Level top surface concrete according to grade and depth specification
Install anchor bolts, steel plates, door sills and other fixtures
Apply hardening and sealing components to cure surfaces
Waterproof, damp proof and restore surfaces
Repair, resurface and replace worn or damaged sections of concrete structures