下列哪些是继发性腹膜炎的病因()
A、腹腔内急性感染扩散
B、较窄性肠梗阻
C、空腔脏器破裂
D、腹部手术后
E、溃疡病穿孔
参考答案:A, B, C, D, E
The second-hand car she bought was almost new ,______,it was in good condition.
A.however
B.besides
C.though
D.therefore (表示一种因果关系)
恶性程度最高的体表肿瘤是
A.皮肤 * * 状癌B.皮肤鳞状细胞癌C.恶性黑色素瘤D.纤维肉瘤E.皮肤基底细胞癌