次生煤泥
参考答案:
选煤过程中,煤炭因粉碎和泥化产生的煤泥。
A. don't there B. didn't there C. isn't there D. doesn't there
下列玻璃中,()是属于装饰玻璃。
A.钢化玻璃
B.磨砂玻璃
C.中空玻璃
D.镀膜玻璃