Miners use __________ to help prevent rocks from falling from the roof., a) timber supports, b) roof bolts, c) concrete supports, __________ are made of concrete and can support mine roofs and walls., a) Concrete supports, b) Steel mesh, c) Roof bolts, Workers use __________ to hold loose rock in place., a) steel mesh, b) timber supports, c) hydraulic supports, __________ are wooden structures used in some mines., a) Steel sets, b) Timber supports, c) Bolt trusses, __________ are strong steel structures used to support wide mine openings., a) Bolt trusses, b) Shotcrete linings, c) Roof bolts, Workers can use __________ to reinforce and protect mine walls., a) steel mesh, b) shotcrete linings, c) timber supports, __________ can bend and absorb pressure without breaking., a) yieldable steel arches, b) concrete supports, c) bolt trusses, __________ provide adjustable support for short periods., a) temporary hydraulic supports, b) steel sets, c) roof bolts, __________ can move and support roofs where necessary., a) powered mobile hydraulic supports, b) steel mesh, c) timber supports, __________ use both bolt and anchoring mechanisms., a) steel sets, b) combination-anchor bolts, c) shotcrete linings

mining book1unit11

by
Print
Embed

Leaderboard

Visual style

Options

Switch template

Continue editing: ?