下列哪项不能提示恶性嗜铬细胞瘤的诊断()
A、肿瘤大于5cm
B、外形不规则
C、T2加权像瘤体呈明显高信号近似CSF
D、后腹膜发现淋巴结肿大
E、上述各项全对
参考答案:C
—The film Tangshan Earthquake will be at 7:30 pm.Shall I pick you up at 6:40 pm?
—OK, I you at that time.
A.was waiting for
B.shall be waiting for
C.have been waiting for
D.shall have waited for
若n是奇数,则数列6,2,16,4,26,8,36,16…的前n项和为( ).