【单选题】Andrew is said ____ a new computer programme last month, but I don't know when he will finish it. [ ]
D.
to have been designing
【单选题】I don't know when he ___. But when he ___ back, I’ll let you know.
【判断题】水泥水化热的大小主要与水泥的细度及矿物组成有关,颗粒愈粗,水化热愈大 。( )
【简答题】50% 羊毛, 50% 黏胶纤维短纤维混纺针织物,按重量计弹性纱线含量为 3% ,幅宽 20 厘米