鹿茸
参考答案：
为刚生出的鹿角，其外面包裹富有血管的皮肤，此期的鹿角称鹿茸。
I cleaned my classroom ___________.[ ]
A. with three hours
B. three hours ago
C. in three hours
D. three hours before
收缩带基材边缘应平整、清洁、无气泡、无裂口及分解变色。
