“portal crane”的概念、定义、翻译、参考文献-科学参考

单词	portal crane
释义	portal crane [`pȯrd·ǝl `krān] ^{MECHANICAL ENGINEERING} A jib crane carried on a four-legged portal built to run on rails.
随便看	obliquity factor obliquity of the ecliptic obliterated corner obliterating endarteritis obliteration obliterative appendicitis oblong mesh O/B/O carrier Oboe Obolellida obovate obscuration obscured sky cover obscure glass obscuring phenomenon obsequent obsequent fault-line scarp observability observable operator observable quantity observational day observation of fire observation spillover observation well observed fire

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