问题
多项选择题
双块式无砟道床路基地段道床结构由（）等部分组成，道床板一般为纵向连续的钢筋混凝土结构。
A.双块式轨枕
B.道床板
C.混凝土底座
D.支承层
答案
参考答案：A, B, D
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双块式无砟道床路基地段道床结构由（）等部分组成，道床板一般为纵向连续的钢筋混凝土结构。
A.双块式轨枕
B.道床板
C.混凝土底座
D.支承层
参考答案：A, B, D
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| A farmer asked his son, a fifteen-year-old boy to work on the farm for one year. Every day the boy got up early and worked 1 until evening, just like his father. Time passed quickly. The boy's crops (庄稼) grew well. 2 the last day of the year, the father called his son to him,"I'm very happy to see that you have done well for the whole year", said the father,"I'll give you a present, tell me 3 you want".The boy smiled and showed his father a big piece of bread made from his wheat (小麦). "I've already got the 4 present. No pains, No gains. I think this is what you wanted 5 to know". His father was quite pleased to hear that. | |||
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