问题
问答题 简答题
路面基层有几类，各有什么特点？
答案
参考答案：
路面基层分柔性基层和半刚性基层，柔性基层，即粒料基层如天然砂砾，级配碎石等，水稳性好，刚度低，无抗拉强度.半刚性基层，即采用结合料与矿料按一定配比经拌和，摊铺和碾压形成的整体性材料，刚度大，并具有一定的抗拉强度.
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路面基层有几类，各有什么特点？
参考答案：
路面基层分柔性基层和半刚性基层，柔性基层，即粒料基层如天然砂砾，级配碎石等，水稳性好，刚度低，无抗拉强度.半刚性基层，即采用结合料与矿料按一定配比经拌和，摊铺和碾压形成的整体性材料，刚度大，并具有一定的抗拉强度.
| 从对话后的方框中选择适当的选项补全对话。 | |
| Jim: Hey, Sally! I didn't see you last weekend. Sally: No, I stayed at home. Jim: 1______ Sally: Well, I had lots of things to do. Jim: 2______ Sally: Well, I cleaned my room, and I did my homework. Jim: You did? Not much fun, huh? Sally: 3______ On Sunday I went to the library. How about you? What did you do? Jim: Well, I played soccer on Saturday morning. On Saturday afternoon, I went to movie. And on Sunday night, I visited my friend. Sally: 4______ Jim: Yeah, I had fun. But I didn't do my homework, so school this morning wasn't fun!
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