a-frame derrick人: human being; man; person; pe ...吊杆: boom; hanger rod; sag tie; s ...架: frame; rack; shelf; stand管形吊杆: tubular derrick箱形吊杆: box-type boom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:人字形吊杆架，即可在微信中查询翻译
