【判断题】对模型进行切片时,层片厚度越小,打印质量越高。( )
【单选题】-----What were you up to when she dropped in? ------I______ for a while and _____ some reading.
C.
had played :was going to do
D.
was playing; was going to do
【单选题】They knew that things weren't right at home.It means .A. Bob had no food to give th
A.
27. They knew that things weren't right at home.It means . A. Bob had no food to give them
B.
Bob couldn't open the door
C.
it was very cold outside
D.
they were too young to eat anything