【单选题】【消耗次数：1】
砼拌制二次投料与一次投料相比较，砼强度可提高_____%；在砼强度等级相同的情况下，可节约水泥_____%
①
15 /15~20
②
20/20~30
③
10/15~20
④
20/15~30
参考答案：
复制
纠错
相关题目
【单选题】
柱子的校正完毕后，杯口内细石砼第一次浇至（） ，待强度达到设计强度 （）%时，拔去楔子二次浇注砼至（）。
①
杯底上100mm处/ 75/ 杯顶
②
杯底上50mm处/ 25 / 杯顶
③
楔底/ 50/ 地面
④
楔底/ 25/ 杯顶
【单选题】
已知四点A（10、20、30）、B（30、20、10）、C（10、20、10）、D（20、20、30），则对H面的重影点为______。
①
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
A与D，D点可见
②
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
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B与C，B点可见
③
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
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A与C，A点可见
④
Normal
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7.8 磅
0
2
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false
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EN-US
ZH-CN
X-NONE
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A与C，C点可见
【单选题】
已知三点A（10、20、15）、B（10、0、30）、C（0、10、0），则在坐标面上的点为______。
①
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
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A、B、C三点
②
Normal
0
7.8 磅
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2
false
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EN-US
ZH-CN
X-NONE
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B点
③
Normal
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EN-US
ZH-CN
X-NONE
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B、C两点
④
Normal
0
7.8 磅
0
2
false
false
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EN-US
ZH-CN
X-NONE
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C点
随机题目
【单选题】
宪法的修改需要由全国人民代表大会常务委员会或者1／5以上全国人民代表大会代表提议，并由全国人民代表大会以全体代表的（）以上的多数通过。
①
1／2
②
3／4
③
5／6
④
2／3