关于增生型结肠癌X线气钡双重造影征象的描述,不正确的是:()
A.肿瘤向腔内隆起
B.肿块表面菜花状
C.病变黏膜浅溃疡
D.肿瘤邻近肠壁厚
E.肿瘤多为窄基底
参考答案:E
-What are you looking ______?
-My watch. I can't find it now. Have you seen it anywhere? [ ]
A. up
B. for
C. out
D. back
已知某空调系统进风管道截面为圆形截面,其直径为200mm,测得风速为7m/S.求进风量