短語詞組短語back -to- testing 反饋試驗(yàn);背靠背試驗(yàn);對(duì)比測試;對(duì)拖試驗(yàn)A full back -testing system 一個(gè)完整的回測系統(tǒng)perforation -back flowing-pressure gauge testing 射孔 返回 back-testing