根据混凝土相关规范规定，下列哪些是属于混凝土原材料（）
A.水泥
B.粗、细骨料
C.掺和料
D.水
参考答案：A, B, C, D
智力测试。
1. What number is missing from the final (最后的) box? ______________
2. What is the last letter? _____________
J A S O N ?
3. One night, a thief (贼) is in Bobby's house (房子). Bobby is reading an English book, " O-I-C-U; O-I-C-U ",
the thief runs away. Do you know why?
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