【单选题】【消耗次数：1】
《混凝土结构设计规范》规定，预应力混凝土构件的混凝土强度等级不应低于（）。
①
C30
②
C35
③
C40
④
C20
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相关题目
【单选题】
混凝土强度等级C30表示：
①
混凝土的立方强度≥30N/mm2
②
混凝土的棱柱体抗压强度设计值≥30N/mm2
③
混凝土的轴心抗压强度标准值≥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C30表示：
①
混凝土的立方强度≥30N/mm2
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C20的含义为（ ）。
①
抗压强度≥20MPa
②
平均抗压强度=20MPa
③
抗压强度≥20Mpa的混凝土占总体95％以上
④
平均抗压强度>20MPa
【单选题】
混凝土结构设计规范》定义的裂缝宽度是指：
①
受拉钢筋重心水平处构件底面混凝土裂缝宽度
②
受拉钢筋重心水平处构件侧表面上混凝土裂缝宽度
③
构件底面上混凝土裂缝宽度
④
构件侧表面上混凝土裂缝宽度
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【单选题】
We’ll go out as soon as I’ve ____ the kitchen.
①
sent for
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cleaned up
③
done with
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worked out
【单选题】
“I haven’t read ____ of the last four chapters, so I know little about them.”
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something
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some
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any
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anything
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will finish
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will have finished
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finishes
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would finished
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Even great musicians require ____ practice.
①
convenient
②
continual
③
continuous
④
contrary
【单选题】
Wealthy ____ he was, the governor would not spend a penny on such things.
①
as
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if
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though
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however
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—Guest: Oh, it’s ten o’clock. I’d better go now.—Host: ____.
①
OK. Please walk slowly and take care.
②
Why do you want to go now? Don’t you want to stay?
③
Yeah, it’s really late. Why not immediately?
④
Won’t you stay for another cup of coffee?
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which
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it C. that D. this
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that
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this
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make ?
②
had made ?
③
makes ?
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①
hold--back
②
associate--with
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put--down
④
turn--out