boom crane吊杆: boom; hanger rod; sag tie; s ...起重机: crane; derrick; crab; freigh ...可伸缩吊杆起重机: telescopic boom crane伸缩式吊杆起重机: telescopic boom crane使起重机吊杆起落: luff下载手机词典可随时随地查词查翻译关注微信公众号:chachacidian,回复:吊杆起重机,即可在微信中查询翻译