耐火材料的性质有（）。
A.耐火度
B.气孔率
C.抗渣性
D.荷重软化温度
参考答案：A, B, C, D
—Does your friend like salad?
— _________. [ ]
A. Yes, she like.
B. No, she does.
C. Yes, she doesn't
D. No, she doesn't.
肺结核分哪几型，各型X线表现如何?
