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【单选题】
与强度等级较低的混凝土相比,C50及其以上混凝土的特点是()。
【单选题】
混凝土强度等级C30表示:
④
混凝土的立方强度达30N/mm2的概率不小于95%
【单选题】
混凝土强度等级C30表示:
②
混凝土的棱柱体抗压强度设计值<imgwidth="17"height="24"v:shapes="_x0000_i1068"src="http://wljy.whut.edu.cn:80/uploadfiles/word/GCJG1.files/image065.gif">≥30N/mm2
③
混凝土的轴心抗压强度标准值<imgwidth="22"height="24"v:shapes="_x0000_i1069"src="http://wljy.whut.edu.cn:80/uploadfiles/word/GCJG1.files/image067.gif">≥30N/mm2
④
混凝土的立方强度达30N/mm2的概率不小于95%
【单选题】
混凝土强度等级以C加数字表示,数字为()。
【判断题】
锚栓锚固法适用于已严重风化的混凝土强度等级为C20∽C60的混凝土承重结构的改造、加固。
【单选题】
混凝土强度等级C30中的30是指混凝土的( )。
【单选题】
某批混凝土经抽样,强度等级为C30,意味着该混凝土()。
①
立方体抗压强度达到30N/mm2的保证率为95%;
③
棱柱体抗压强度达到30N/mm2的保证率为95%
【判断题】
扩展基础的钢筋混凝土强度等级不应小于C15。 ()
【单选题】
混凝土强度等级的选用须注意与钢筋强度的匹配,当采用HRB335、HRB400钢筋时,为了保证必要的粘结力,混凝土强度等级不应低于C25;当采用新HRB400钢筋时,混凝土强度等级不应低于C30。
【单选题】
26. It was _____ great shock to the world that two airplanes crashed into _____ World Trade Centre in New York on Sept.11.
【单选题】
29. We must remember that _____fashion is not the most important thing in _______ life.
【单选题】
22. The two old sisters,_______ so long,held each other and burst into tears.
【单选题】
30. It _____ quite a few years _____ the accused was declared innocent and set free.
【单选题】
36._____ their real economic situations, they got some relief fund from the government.
【单选题】
35.No matter how frequently _____ the works of Beethoven always attract a large number of people.
【单选题】
38. In recent years much more emphasis has been put______ developing the students productive skills.
【单选题】
39. A survey was carried out on the death rate of those who were infected by SARS, ________were surprising.
【单选题】
34.I heard that you really had a wonderful time at Johns birthday party, _____?
【单选题】
37._____ of water makes Death Valley a desert, but it is by no means devoid.