A.拉伸試驗(yàn)機(jī)B.恒溫烘箱C.恒溫水浴D.天平
A.溫度20℃,相對(duì)濕度45%B.溫度21℃,相對(duì)濕度50%C.溫度23℃,相對(duì)濕度55%D.溫度25℃,相對(duì)濕度60%
A.50minB.55minC.60minD.65min