木器家具漆，有哪几大类？
参考答案：1、NC-硝基漆
2、AC-酸固化漆
3、PU-聚氨酯漆
4、PE-不饱和聚酯漆
5、UV-光固化漆
6、水性漆
If I were you, I would take it easy; _____ is no need to be nervous. [ ]
A. it
B. this
C. there
D. which
牙源性钙化上皮瘤内的嗜伊红物质是（）
A.淀粉样物质
B.发育不良的牙本质
C.牙骨质样物质
D.黏液样物质
E.变性的肿瘤细胞
