肉瘤的特征是()
A.青年人好发
B.切面灰红、鱼肉状
C.瘤细胞弥散排列
D.瘤细胞呈巢排列、血液供应丰富
E.多经血道转移
参考答案:A, B, C, E
0.145×200的积有两位小数…______.
Heart ______ is much more common these days than it was even ten years ago.
A. surgery B. surgeonC. work D. circulation