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单项选择题

下列选项中哪一类桩不适宜采用高应变法检测基桩竖向抗压承载力？（ ）

A.混凝土预制桩
B.打入式钢管桩
C.中等直径混凝土灌注桩
D.大直径扩底桩
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未知题型
Winged robot learns to fly
Learning how to fly took nature millions of years of trial and error-but a winged robot has cracked it in only a flew hours，using the same evolutionary principles．
Krister Wolff and Peter N0rdin of Chalmers University of Technology（CUT） in G0thenburg，Sweden，built a winged robot and set about testing whether it could by itself， without any programmed（预先设定好的）data 0n what napping is or how to d0 it．
To begin with，the robot just twitched and jerked（猛抽）erratically（不稳定地）．But gradually，it made movements that gain height． After it cheated—simply standing on its wing tips was one early short cut． After three hours，however，the robot abandoned such methods in favor 0f a more effective flapping technique，where it rotated its wings through 90 degrees and raised them before twisting them back to the horizontal and pushing down．
“This tells us that this kind of evolution is capable of coming up with flying motion，”says Peter
Bentley，who works on evolutionary computing at University College London． But while the robot had worked out how best to produce lift，it was not about to take ofF.“There’s 0nlv s0 mach that evolution can do， ' Bentley says． “This thing is never going to by because the motors will never have the strength t0 do it，”he says． The robots had metre-long wings made from balsa wood and covered with a light plastic film．
Small motors on the robot let it move its wings forwards 0r backwards，up or down 0r twist them in either direction．
The team attached the robot to two vertical rods，so it could slide up and down． At the start of a test，the robot was suspended by an elastic banD.A movement detector measured how much lift．if any，the robot produced for any given movement．
A computer program fled the robot random instructions， at the race of 20 per seconD.to test its flapping abilities． Each instruction told the robot either to do nothing or to move the wings slightly in the various directions．
Feedback from the movement detector let the program work out which sets of instructions were best at producing lift． The most successful ones were paired up and “offspring' sets 0f instructions were generated by swapping（交换）instructions randomly between successful pairs．These next-generation instructions were then sent to the robot and evaluated before breeding a new generation， and the process was repeateD.
第 26 题 Which of the following is NOT true of what is mentioned about the winged robot in the second paragraph?
A.The two professors of CUT built the winged robot
B.The two professors of CUT tested whether the winged robot could learn to fly
C.The two professors of CUT programmed the data on how the robot flapped（拍打）its wings
D.The two professors of CUT tried to find out if the robot could fly by itself
多项选择题
岩土工程治理预算费用包括（ ）。
A.定额直接费
B.岩土勘察费
C.其他直接费和间接费
D.计划利润和税金
多项选择题
工程建设项目可行性研究的作用包括（ ）。
A.是建设项目投资决策和编制设计任务书的依据
B.是银行向施工企业拔款或贷款的依据
C.是确定工程造价的依据
D.是工程设计与工程建设的依据
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