Some essentialities in operation and maintenance of high speed trains are discussed.
論述了高速列車在運(yùn)用檢修中的若干個(gè)基本問題.
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There are many factors influencing spontaneous combustion in goaf and their relative essentialities are different.
采空區(qū)自然發(fā)火的影響因素很多,各因素之間的相對重要性不同.
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