预应力混凝土、喷射混凝土、蒸汽养护混凝土、其他混凝土标准养护试验龄期有何规定？试件的取样和留置频率有何规定？
参考答案：
预应力混凝土、喷射混凝土、蒸汽养护混凝土标准养护试件试验龄期为28d，其他混凝土标准养护试件试验龄期为56d。
试件的取样和留置频率规定如下：（1）每拌制100盘且不超过100m3的同配合比混凝土取样不得少于一次；（2）每一工作班拌制的同一配合比的混凝土不足100盘试件，取样不得少于一次；（3）现浇混凝土每一结构部位，取样不得少于一次。（4）每次取样应至少留置一组试件。
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| My husband and I sat outside. A small child about three came up the street, accompanied by her mother. As she saw another girl a few feet away, she gave her admiring comment, "Mommy, I like her dress." Her mom 1 , "Well, why don't you go and tell her?" The little girl walked 2 toward the girl wearing the pretty dress. The other one, 3 the same age, was standing with her 4 turned, alongside her parents. They had not heard the compliment (赞美). Receiving no answer, this little one 5 . My husband said to the other girl, " 6 wants to tell you something." As she turned around, connection was made. Once again, the little one 7 "I like your dress," and upon hearing those words, the other one gave her a big smile and excitedly 8 "Look, it's a spinning (旋转) dress!", at which moment she began to spin in 9 . Both of them smiled widely. Now, the one stopped spinning and said, "It's my favorite dress and I have (a) 10 that match!" She 11 running toward a stroller (婴儿车) parked nearby. The mom and the daughter started to 12 down the street, 13 the encounter (邂逅) had ended. Moments later, the "spinning dress girl" reappeared, shoes in hand, 14 her new friend who had seemingly disappeared. Now, an elderly couple, seated on a bench, had obviously been 15 of all this. The man 16 the child, saying, "There's someone coming behind you." Then we saw one showed and the other 17 the beautiful shoes. If you can make a 18 better, do it. I have no idea how many others that evening might have 19 this act, hoping to help good things to happen. But such brief moments, 20 together, make up what might very well be the important times in our lives.
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