问题
单项选择题
正线道岔直向与曲线之间应有长度不短于20m的直线过渡段，站线道岔的过渡直线一般不得短于（）。
A.4.5m
B.6m
C.7.5m
D.20m
答案
参考答案：C
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正线道岔直向与曲线之间应有长度不短于20m的直线过渡段，站线道岔的过渡直线一般不得短于（）。
A.4.5m
B.6m
C.7.5m
D.20m
参考答案：C
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| Dear Lin Tao, Thank you for your letter. Your __1__ life is really interesting! I __2__ I can go to visit you soon. Now I would like to tell you something __3__ my life at school in Canada. We__5__ to go to school from Monday to Friday. Classes __4__ at nine o'clock. After fifty minutes, there is a short rest. __6__ this time, we __7__ eat some food in the dining hall or play sports outside. It's relaxing. We have lunch at school. The food there is delicious. Classes end at 3:30 in the __8__ and then we can have fun in all kinds of clubs. I know Chinese students usually have lots of homework __9__ every day. We also have homework, but it isn't too __10__. Best wishes ! Cindy | ||||
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