extension-type n. 可伸縮；套管式extension tube n. 伸縮管extension trestle ladder [能源科學(xué)技術(shù)]伸縮式高架梯extension telephone set 電話分機(jī)extension telephone n. 電話分機(jī)extension teaching methods [農(nóng)業(yè)科學(xué)]推廣教學(xué)法extension table 伸縮桌extension spring 拉簧；[機(jī)] 牽簧，[機(jī)] 牽引簧；拉伸彈簧extension spray lance [材料科學(xué)]接長管extension set connection number [數(shù)學(xué)]可拓集聯(lián)系數(shù)extension set 分機(jī)；增設(shè)裝置extension service [勞經(jīng)] 推廣服務(wù)extension scouting [軍事學(xué)]殘障童子軍活動extension recognition methods [交通運(yùn)輸工程]可拓識別方法extension of time limit [土木建筑工程]延展時(shí)限extension of time 延期；延長時(shí)間；延長合約期extension of limitation period [經(jīng)濟(jì)學(xué)]時(shí)效期延長extension of dimension line [機(jī)械工程]尺寸線之延長線extension of class suspension period [醫(yī)藥科學(xué)]延長停課extension number 分機(jī)號碼