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某二级公路全长28.5km，路面结构为：30cm填隙碎石底基层，20em水泥稳定碎石基层，22em水泥混凝土面层（设计弯拉强度5.0MPa）。其中K3+500～K4+020为路堑段，K6+120～K6+850为河滨段。为了汇集和排除路面、路肩和边坡的流水，在K3+500～K4+020路堑两侧设置了纵向水沟。在路面施工中，为了改善混凝土的耐久性，添加了外加剂。通车一年后，K6+120～K6+850路段的路面多处出现纵向裂缝。 为了改善本路段面层的耐久性，可添加的外加剂是（）。
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English and English Community 1 There is no doubt that English is a useful language．The people who speak English today make up the largest speech community in the world with the exception of speakers of Chinese． 2 A speech community is similar to other kinds of communities．The people who make up the community share a common language．Often they live side by side, as they do in a neighborhood (街坊)，a village，or a city．More often they form a whole country．National boundaries，however，are not always the same as the boundaries of a speech community．A speech community is any group of people who speak the same language no matter where they happen to live． 3 We may say that anyone who speaks English belongs to the English speech community．For convenience(方便)，we may divide the speakers into two groups: one in which the speakers use English as their native language, the other in which the speakers 1earn English as a second language for the purpose of education，commerce，and so on． 4 Learning a second language extends one’s vision and expands the mind．The history and literature of a second language record the real and fictional(虚构的)lives of people and their culture；a knowledge of them adds to our ability to understand and to feel as they feel．Learning English as a second language provides another means of communication through which the window of the entire English speech community becomes a part of our heritage． Paragraph 3（）
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在局域网参考模型中，数据链路层被分为MAC子层和_________子层。
汉朝有一种定罪量刑的原则，即允许一定范围的亲属之间互相隐匿犯罪，即所谓的（）。
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