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(zhǎng)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(dòng)

extension recognition methods [交通運(yùn)輸工程]可拓識(shí)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(zhǎng)時(shí)間；延長(zhǎng)合約期

extension of limitation period [經(jīng)濟(jì)學(xué)]時(shí)效期延長(zhǎng)

extension of dimension line [機(jī)械工程]尺寸線之延長(zhǎng)線

extension of class suspension period [醫(yī)藥科學(xué)]延長(zhǎng)停課

extension number 分機(jī)號(hào)碼