问题
单项选择题
( )的内聚力为零。
A．黏性土
B．砂土
C．碎类土
D．软土
答案
参考答案：B
解析：不同类别的土，其土体的内摩阻力和内聚力不同。例如砂土的内聚力为零，只有内摩阻力，靠内摩阻力来保持边坡的稳定平衡。而黏性土则同时存在内摩阻力和内聚力，因此，对于不同类别的土能保持其边坡稳定的最大坡度也不同。
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( )的内聚力为零。
A．黏性土
B．砂土
C．碎类土
D．软土
参考答案：B
解析：不同类别的土，其土体的内摩阻力和内聚力不同。例如砂土的内聚力为零，只有内摩阻力，靠内摩阻力来保持边坡的稳定平衡。而黏性土则同时存在内摩阻力和内聚力，因此，对于不同类别的土能保持其边坡稳定的最大坡度也不同。
Reading for pleasure is the easiest way to become a better reader in English. 小题1: Some students say they don’t want to read for pleasure. They say they want to use their time to learn the rules of the language and new words. They say that pleasure reading is too easy. Many experts say pleasure reading is very important for learning English. Dr. Stephn Krashen, a famous expert on learning languages, says that pleasure reading helps you learn many important things about English. Students learn more grammar and more words when they read for pleasure. 小题2: Dr. Krashen tells us that pleasure reading helps each student in a different way. Each student needs to learn something different. Pleasure reading makes it possible for each student to learn what he or she needs. 小题3: When you read for pleasure, you choose your own books, and you don’t have to remember everything. There are no tests on your pleasure reading books. Pleasure reading will help you: ●learn how English speakers use English ●read faster in English ●find examples of good writing in English ● 小题4: ●learn about the cultures of English speakers
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