I don't think it's important, _____? [ ]
A. doesn't it
B. is it
C. do I
D. isn't it
答案:B
道德评价的标准
A.美与丑
B.虚与实
C.公与私
D.善与恶
E.人与物
无缝线路伸缩区长度一般取(),宜取为标准轨长度的整倍数。
A.25~50m
B.50~100m
C.100~150m
D.150~200m