电气线路非锗、硅，最常见的元器件故障主要有（）种。
A.1
B.2
C.3
D.4
参考答案：C
----What do you think of this film?
----Very bad. __________.
A．Nothing could be worse.
B．Nothing could be better.
C．I like it a little.
D．You just couldn’t find a better one.
牙源性角化囊肿影象学表现为（）。
A.单囊多见
B.上皮表面不全角化
C.上皮角化层呈指状凸起
D.上皮基底细胞呈栅栏状排列
E.以上都不对
