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问题 单项选择题

某柱下钢筋混凝土独立基础，基础底面尺寸为2.0m×2.5m。持力层为粉土，其下为淤泥质土软弱层。由柱底传竖向力为F，力矩为M和水平剪力为V(均为设计值)，如题图所示。计算基础自重设计值和基础上的土重标准值用的平均重度γG=20kN/m3。

当粉土层的压缩模量Es1=8MPa、淤泥质土层的压缩模量Es2=2MPa时，其地基压力扩散线与垂直线的夹角θ应取（）项数值。

A．θ=22°

B．θ=24°

C．θ=30°

D．θ=40°

答案

参考答案：B

解析：

由规范表5．2．7查得0=24°

问答题 简答题

简要说明绝对感受性和绝对感觉阈限之间的关系。
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单项选择题

What’s your earliest childhood memory Can you remember learning to walk Or talk The first time you heard thunder or watched a television program Adults seldom (1) events much earlier than the year or so before entering school, (2) children younger than three or four (3) retain any specific, personal experiences.

A variety of explanations have been (4) by psychologists for this "childhood amnesia". One argues that the hippo-campus; the region of the brain which is (5) for forming memories, does not mature until about the age of two. But the most popular theory (6) that, since adults don’t think like children, they cannot (7) childhood memories. Adults think in words, and their life memories are like stories or (8) one event follows (9) as in a novel or film. But when they search through their mental (10) for early childhood memories to add to this verbal life story, they don’t find any that fit the (11) . It’s like trying to find a Chinese word in an English dictionary.

Now psychologist Annette Simms of the New York State University offers a new (12) for childhood amnesia. She argues that there simply aren’t any early childhood memories to (13) . According to Dr. Simms, children need to learn to use someone else’s spoken description of their personal (14) in order to turn their own short-term, quickly forgotten (15) of them into long-term memories. In other (16) , children have to talk about their experiences and hear others talk about (17) --Mother talking about the afternoon (18) looking for seashells at the beach or Dad asking them about their day at Oceanz Park. Without this (19) reinforcement, says Dr. Simms, children cannot form (20) memories of their personal experiences.

Notes: childhood amnesia 儿童失忆症。

（15）（）

A.impressions

B.beliefs

C.minds

D.insights
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