题目内容:
What can be extracted from fine-powder fly ash?
A. Aluminum, silicon, and magnetic.
B. Additive.
C. Paving material.
D. Cement.
参考答案:
What can be extracted from fine-powder fly ash?
A. Aluminum, silicon, and magnetic.
B. Additive.
C. Paving material.
D. Cement.