沥青混凝土的温度稳定性较差,在高温季节,表面易产生()等现象。 A、波浪。 B、推挤。 C、裂缝。 D、拥包。
沥青砼面层横向裂缝产生的原因可能是() A、施工缝未处理好。 B、半刚性基层收缩裂缝反射。 C、温度应力作用。 D、雨水侵蚀。
Where is the rail service better than U.S? () Canada 。 Europe 。 Japan 。 Nowhere。
Cost of pipeline is very different of underground conditions. Is it right? () Not 。 Yes 。 They can’t compare 。 Not discussion in the paragraph。
Pipeline is able to deliver the products based on the advantages of low rate of loss and damage, minimal climatic effects and reduced labor cost. Do you agree? () Yes, I do. 。 No, I do think so. 。 I don’t find it here 。 I can’t find it here。
If you make different trade in different countries, you must take different transport modes? ()