【题干】Materials are usually described as 'rock', 'loose rock', or 'common', with 'common' signifying all material not otherwise classified. Rock, sometimes called 'solid rock', nearly always must be drilled and blasted, then loaded with a front-end loader or power shovel into trucks or other hauling units. Blasted rock may be moved or drifted for short distances by means of a bulldozer, which is, in effect, a huge tractor-mounted blade. Loose rock often is dug with loaders or shovels without any previous blasting.
【题目】According to the passage, which of the following is true? ()纠错
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