菌斑是()
A.唾液蛋白在牙面的沉积物
B.食物残渣在牙面的沉积物
C.细胞外多糖在牙面的沉积物
D.唾液糖蛋白在牙面的沉积物
E.未矿化的细菌性沉积物
参考答案:E
润滑油的粘度比越大越好.
— The doctor told me not to eat too much, but I find it difficult.
— The doctor is right. you eat, you will be.
A.The less; the healthier
B.The less; the more healthier
C.The more; the healthier
D.The more; the more healthier