基牙向缺隙方向倾斜,近缺隙侧倒凹大,远缺隙侧倒凹小,此时绘出的观测线为()
A.Ⅰ型观测线
B.Ⅱ型观测线
C.Ⅲ型观测线
D.以上均不是
E.以上均是
参考答案:B
— Does your mother wash clothes?
— ______________[ ]
A. Yes, she doesn't.
B. Yes, he does.
C. No, she doesn't.
消毒染有霍乱弧菌食具的最佳消毒措麓是()
A.紫外线
B.煮沸
C.0.5%过氧乙酸
D.3%漂白粉
E.3%的来苏儿