碎石和卵石的压碎指标试验时，称取试样的质量为2.5kg。
参考答案：错
60kg/m钢轨普通线路维修周期为（）。
A.60～90Mt
B.50～70Mt
C.100～150Mt
D.120～180Mt
Wouldn't you feel rather________if you rushed to the airport to meet your friends only to find that
they had already been picked up by other people? [ ]
A. satisfied
B. happy
C. annoyed
D. bored
