surface mining methods造句

例句与造句

1. About 80 percent of Alberta's bituminous deposits can be extracted using in-situ methods such as steam assisted gravity drainage and 20 percent by surface mining methods.
2. Additional sub-surface mining methods include hard rock mining, which is mining of hard rock ( igneous, metamorphic or sedimentary ) materials, bore hole mining, drift and fill mining, long hole slope mining, sub level caving, and block caving.
3. It's difficult to find surface mining methods in a sentence. 用surface mining methods造句挺难的