【单选题】【消耗次数：1】
混凝土立方体抗压强度标准值是由混凝土立方体试块测得的，以下关于龄期和保证率的表述中，正确的是（）。
①
龄期为21d，保证率为90%
②
龄期为21d，保证率为95%
③
龄期为28d，保证率为95%
④
龄期为28d，保证率为90%
参考答案：
复制
纠错
相关题目
【单选题】
根据《混凝土结构设计规范》的规定：混凝土立方体抗压强度标准值是指按照标准方法制作边长为( )mm的立方体试件，养护28d后，用标准试验方法测得的具有95%保证率的抗压强度。
①
100
②
150
③
200
④
250
【单选题】
根据《混凝土结构设计规范》的规定：混凝土立方体抗压强度标准值是指按照标准方法制作边长为150mm的立方体试件，养护( )d后，用标准试验方法测得的具有95%保证率的抗压强度。
①
7
②
21
③
28
④
30
【判断题】
混凝土立方体抗压强度标准值系指按照标准方法制成边长为150mm的标准立方体试件，在标准条件（温度20℃±2℃，相对湿度为95%以上）下养护28d，然后采用标准试验方法测得的极限抗压强度值。
①
正确
②
错误
【单选题】
混凝土立方体抗压强度试件的标准尺寸为（）。
①
100mm×100mm×100mm
②
150mm×150mm×150mm
③
200mm×200mm×200mm
④
70．7mm×70．7mm×70．7mm
随机题目
【简答题】
Direction: Fill in the blanks with the words given below. Change the form if necessary.[chore; talent; crowded; earnings; finance; festive; memorable; sacrifice; smash; reproduction]2. A[填空1]is a copy of something such as a piece of furniture or a work of art.
【简答题】
Directions: Fill in the blanks with the words given below. Change the form if necessary.(pros and cons; allocation; update; complexity; infancy; initially; minimal;strategically; grab; digest)4. Do you have the[填空1]yet?
【简答题】
Direction: Fill in the blanks with the phrases given below. Change the form if necessary.[collide with; take hold of; for a moment; head for; ever since; be full of; share with; make fun of]1. Ann had lived in a cottage[填空1]she was born, and had no wish to move to a tower block.
【简答题】
Direction: Fill in the blanks with the phrases given below. Change the form if necessary.[sell out; in other words; consist of; stand for; rely on; demand for; engage in; at hand; yield to; confront with]1. They have[填空1]of the brand that I like.
【简答题】
Directions: Translate sentence by using “nothing more than”.4. We ______________(意思只不过是说). This is the usual condition of things on our earth.
【简答题】
Translate the following sentence into English.这是一次重要的会议，请务必不要迟到。
【简答题】
Translate the following sentence into English.老师要求她这个学期要投入到学习之中。
【简答题】
Direction: Fill in the blanks with the phrases given below. Change the form if necessary.[have access to; go off; desperate for; put up with; always the case; give advice; concentrate on; arrive at; make an effort; come in handy]1. We may[填空1], but we cant give conduct.
【简答题】
Direction: Fill in the blanks with the words given below. Change the form if necessary.[assumption; contact; cliff; equivalent; emergency; outweigh; height; rummage; vibration; bugbear]5.Even the cheapest car costs the[填空1]of 7 yearssalary for a government worker.
【简答题】
Directions: Fill in the blanks with the words given below. Change the form if necessary.[fee; react; expand; besides; quantity; stay; highly; device; customer; commercial]2.I want to know how he[填空1]to our suggestion.