题目内容
一埋置于黏性土中的摩擦型桩基础，承台下有9根直径为d、长度为l的钻孔灌注桩，承台平面尺寸及桩分布如下图所示，承台刚度很大，可视为绝对刚性，在竖向中心荷载作用下，沉降均匀，你认为下面对承台下不同位置处桩顶反力估计，()是正确的。
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拟建场地的外缘设置6.2m高的挡土墙，场地土的内摩擦角为30°。若不允许把建筑物的基础置于破坏棱体范围内，则对于平行于挡土墙的外墙基础，当基础宽度为2m、埋置深度为1.0m时，外墙轴线距挡土墙内侧的水平距离不应小于()。
下图为砂土的颗粒级配曲线，属于下列()类。
Section B
Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C and D. You should decide on the best choice.
Going online is a favorite pastime for millions of American children. Almost 10 million (14 percent) of America's 69 million children are online. The Internet both entertains and educates children, however, there are some possible negative consequences for children who access kid-based Web sites. Advertising on kid-based Web sites has become both a rapidly growing market for consumer companies and a concern for parents. With a click on an icon, children can link to advertisers and be granted tremendous spending power. Children are an important target group for consumer companies. Children under age 12 spent $ 14 billion, teenagers another $ 67 billion, and together they influenced $ 160 billion of their parents' incomes.
Many critics question the appropriateness of targeting children in Internet advertising and press to require that children be treated as a "special case" by advertisers. Because children lack the analytical abilities and judgment of adults, they may be unable to evaluate the accuracy of information they view, or understand that the information they provide to advertisers is really just data collected by an advertiser. Children generally lack the ability to give consent to the release of personal information to an advertiser, an even greater problem for children when they are offered incentives for providing personal information, or when personal information is required before they are allowed to register for various services. Children may not realize that in many cases these characters provide hotlinks directly to advertising sites.
The Internet does present some challenges for advertisers who want to be ethical in their marketing practices. Many advertisers argue that we underestimate the levels of media awareness shown by children. By the age of seven or eight most children can recognize an advertisement and know that its purpose is to sell something and are able to make judgments about the products shown in advertisements. However, this somewhat optimistic and decidedly libertarian view of children runs aground when we realise that they are (like a surprising number of adults) unable to judge accurately between entertainment and advertising. Adults can fend for themselves but, as marketers, we should be explicit about our purpose when advertising to children on the Internet.
According to the first paragraph, children as an internet market.
下图表示饱和土等向固结完成后，在σ3不变的条件下，继续增加σ1直至破坏的应力路径，图中的α角是(注：ψ为土的内摩擦角)()。
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