胰腺癌最多见的转移和扩散途径为（）
A.癌浸润
B.血行转移
C.淋巴转移
D.腹腔内种植
E.骨转移
参考答案：A, C
It doesn't seem ugly to me. ________,I think it's rather beautiful. [ ]
A. On the contrary
B. In a word
C. On the other hand
D. On one condition
在面向对象方法中，类的实例称为______。
