耳蜗性耳硬化病灶可累及（）。
A.前庭窗
B.镫骨环韧带
C.蜗窗
D.镫骨足板
E.镫骨足弓
参考答案：C
I'm so glad to see you back, Lucy. How long _______ at your grandma's?[ ]
A. had you stayed
B. did you stay
C. have you stayed
D. would you stay
澄清度检查法是检查
A．不溶性杂质B．遇硫酸易炭化的杂质C．水分及其他挥发性物质D．有色杂质E．硫酸盐杂质
