当道路设计车速大于50km/h时，解决对向机动车流的相互干扰问题时，有较高的景观、绿化要求时，道路最好选择的横断面形式应是( )。
A．四块板
B．三块板
C．两块板
D．一块板
参考答案：C
解析： 两块板道路通常是利用中央分隔带(可布置低矮绿化)将车行道分成两部分。当道路设计车速大于50km/h时，解决对向机动车流的相互干扰问题时，有较高的景观、绿化要求时，两个方向车行道布置在不同平面上时，采用两块板的形式。
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| There are many different ways of seeing a town for the first time. One of them is to walk around it, guide- book 1 hand. Of course, we may 2 with our guide-books the history and 3 developments of a town and get to know them. 4 then, if we take out time and 5 in a town for a while, we may get to know it better. When we 6 it as a whole, we begin to have some 7 , which even the best guide-books do not answer. Why is the town just 8 this, this shape, this plan, this size? Why do its streets 9 in this particular way, and not in any 10 why? Here even the best guide-book 11 us. One can't find in it the information about how a town has developed to the 12 appearance. It may not describe the original (最初的) 13 of a town. However, one may get some idea of what I 14 look like by walking around the town. One can also imagine 15 the town was first planned and . Then one can learn more about in what direction the town 16 to develop. What is the 17 of studying towns in the way? For me, it is 18 that one gets a greater depth of pleasure by visiting and seeing a town with one's own eyes. A 19 visit to a town may help one better understand why it is attractive 20 just reading about it in a guide-book. | ||||
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