第19题: [单项选择]关于铸造金属全冠的描述,正确的是()。 A. 铸造金属全冠的邻接关系不易恢复,容易造成食物嵌塞 B. 边缘线长,易发生继发龋坏 C. 牙龈易受刺激形成炎症 D. 修复后不能进行基牙的电活力测试 E. 修复后容易冷热激发酸痛,不适合用于活髓牙 参考答案:D 答案解析:金属材料是电的良导体,在活髓牙的电活力测试时电流被导向铸造金属全冠的边缘,引起牙龈和牙周的不适,影响电活力测试的准确性,因此铸造金属全冠修复后不能进行基牙的电活力测试。
A. he can leave his car anywhere B. he can leave his car at the gate of any shop C. he must look for the sign with the letter P on it D. he can leave his car at tile side of the street 参考答案:C 答案解析:细节题。题目问:如果一名司机想要离开车去商店买些东西,______。他应该怎样做呢 根据本文最后两句“If the driver of a car wants to leave his car and