哪类肺癌在早期就发生淋巴转移（）
A.鳞癌
B.腺癌
C.大细胞未分化癌
D.小细胞未分化癌
E.细支气管肺泡癌
参考答案：D
Do not disturb me. I ________ letters all morning and have written ten so far. [ ]
A. write
B. have been writing
C. have written
D. was writing
概算造价一般可分为( )。
A．合同价
B．结算价
C．各单位工程概算造价
D．建设项目概算总造价
E．各个单项工程概算综合造价
