影响混凝土强度的主要因素是什么?
参考答案:
(1)水泥强度等级、水灰比;
(2)骨料;
(3)养护龄期;
(4)养护条件;
(5)浇捣条件。
你能猜出它们是什么吗?
a. garden b. canteen c. library d. washroom e. playground
1. You can eat some noodles in it.
It is a _____.
2. You can read many books in it.
3. There are many flowers in it.
治燥剂的分类及其适应证有哪些?