1.What is the standard minimum 28‑day compressive strength for normal structural concrete?
1.普通结构混凝土标准28天抗压强度最低要求是多少？
2.Which cement type is commonly used for early‑strength pile load testing?
2.哪种水泥类型通常用于早期强度桩基荷载测试？
3.What is improved in concrete when well‑graded aggregate is used?
3.使用级配良好的骨料（Well-Graded Aggregate）可以改善混凝土的什么性能？
4.Above what free‑fall height must concrete be placed using methods to prevent segregation?
4.当混凝土自由落下高度超过多少时，必须采用防止离析的方法进行浇筑？
5.When excavating for a swimming pool, what rule governs the distance to nearby buildings?
5.开挖游泳池时，与附近建筑物之间的距离应遵循什么规定？
6.To what minimum level must foundation backfill be compacted?
6.基础回填土必须压实到最低多少密实度？
7.What is a key reason for founding structures below the finished ground surface?
7.建筑物基础设置在完成地面以下的重要原因是什么？
8.Which components in concrete are considered chemically active?
8.混凝土中哪些成分被认为具有化学活性？
9.What nominal stress value is typically used for routine pile load testing?
9.常规桩基荷载试验通常采用的标准应力值是多少？
10.In which situations are caisson foundations most often specified?
10.沉箱基础（Caisson Foundation）通常在哪些情况下采用？
