常見例句雙語例句Where a primary reference standard is not available from an officially recognized source, an in-house primary standard should be established.從官方認(rèn)可的貨源處無法得到基本參考標(biāo)準(zhǔn)品時(shí)，應(yīng)該制備一個(gè)“內(nèi)部基本標(biāo)準(zhǔn)品”。zhuyujiao1972.blog.163.com 返回 officially recognized standard