边缘嵴的生理功能是()
A.排溢食物的主要通道
B.有引导侧方运动的作用
C.将食物局限在(牙合)面窝内
D.捣碎食物的主要工具
E.咀嚼时联合切削的作用
参考答案:C
Victor apologized for ______ to inform me of the change in the plan. [ ]
A. his being not able
B. him not to be able
C. his not being able
D. him to be not able
矿渣粉对混凝土的贡献,不仅取决于它的活性指数,更重要的是它的()。
A.碱度
B.密度
C.烧失量
D.粉磨细度