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问题 单项选择题

某高层建筑采用满堂布柱的钢筋混凝土柱筏基础及地基的土层分布，如图1-4-24所示。柱为摩擦柱，桩距为4d（d为桩的直径）。由上部荷载（不包括筏板自重）产生的筏板底面处相应于荷载效应准永久组合时的平均压力值为600kPa，不计其他相邻荷载的影响。筏板基础宽度B=28．8m，长度A=51．2m；群桩外缘尺寸的宽度=28m，长度α=、50．4m。钢筋混凝土有效长度取36m，即假定桩端计算平面在筏板底面向下36m处。

假定桩端持力层土层厚度h=30m，在桩底平面实体深基础的支承面积内，对应于荷载效应准永久组合时的附加压力为750kPa；且在计算变形量时，取ψ=0．2。又已知，矩形面积土层上均布荷载作用下的角点的平均附加应力系数，依次分别为：在持力层顶面处=0．25，在持力层底面处=0．237。试问，在通过桩筏基础平面中心点竖线上，该持力层土层的最终变形量（mm），应与下列何项数值最为接近？（）

A.93 

B.114 

C.126 

D.184

答案

参考答案：C

单项选择题

Questions 61-70 are based on the following passage.


While some international couriers are showing signs of exhaustion, EMS (Express Mail Service), the generic name for the courier services of post offices, seems to be finding its stride. Known as Datapost in Britain, as Chronopost in France, and as A1-Barid al-Mumtaz in Saudi Arabia, EMS is now second in the international courier business (jointly with TNT Skypack). Last year it delivered 5.6 million items, weighing less than 20 kilograms each, across borders. That and its annual growth rate of around 5 percent have worried DHL, the market leader, enough for it to counter-attack in the Courts.
On October 26, a Dutch judge ruled against DHL on all three counts filed against the Dutch post office: that the three-initial name was too close to DHL’s; that the orange lines in the EMS logo were too similar to DHL’s dark red ones; and that the claim to the widest route system in the world was unfounded. DHL has threatened the Swiss post office with similar action, but it may reconsider after the Dutch ruling.
EMS has some advantages over the private couriers. One is a dense ready-made network of offices, especially in Europe, the avowed target area of the private couriers. Another advantage is a long tradition of working with customs authorities. In a business where minutes count, it pays to have good friends at customs. That advantage particularly irritates the private couriers because there is no legal way to combat such unquantifiable coziness.
The private courier services are also annoyed because in countries like Switzerland and Italy, where the post office is officially a monopoly, they pay it a fee. In Switzerland DHL says it pays more than SFr lm ($ 708,000) "to the competition" each year. In France the couriers have won a battle for exoneration.
Although governments are under little pressure to keep prices artificially low, EMS is often cheaper than the private couriers, but not always. A recent test in Britain (on a domestic route) showed Datapost about halfway between the least and the most expensive, but gave it full marks for speed and service.
Each national EMS is free to set its rates and follow its own rules on things like bulk discounts. The Universal Postal Union, based in Berne, determines how costs and revenues are split between sending and receiving countries, and standardizes procedures. More than 100 postal administrations have linked into the system—and more are coming, including Russia’s. That makes the feisty EMS particularly happy since its rivals have not been allowed to serve anywhere in Russia.

Which of the following can be inferred about Russia

A. Russia needed to compete with other European countries in EMS.
B. There were no private courier services in Russia.
C. The postal administration in Russia linked with the network long ago.
D. Russia was quite hesitant in the international cooperation.
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多项选择题

80%左右的1型糖尿病患者可能呈阳性的抗体有（）

A.胰岛素自身抗体

B.胰岛细胞自身抗体

C.抗中性粒细胞胞浆抗体

D.酪氨酸磷酸酶自身抗体

E.谷氨酸脱羧酶自身抗体
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