患者男,62岁,因“声音嘶哑,咳嗽痰中带血”来诊。初诊为慢性咽喉炎,治疗3个月后,声音依然嘶哑不见好转,发音也越来越困难,病情明显加重,再次入上级医院诊治。患者吸烟40年。喉镜:左侧声带前有一菜花状肿物,质脆,触之易出血。提示若显微镜下见在原位癌或浸润癌的背景下,出现一些细胞密集的浸润性小细胞岛,细胞岛周边的癌细胞呈栅栏状排列,似基底细胞样。最有可能的诊断为()
A . 鳞状细胞癌
B . 疣状癌
C . 小细胞癌
D . 基底细胞样鳞状细胞癌
E . 淋巴上皮癌
F . 肉瘤样癌
G . 腺癌
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设有关系R(A,B,C)和S(C,D)。与关系代数表达式πA,B,D(σR.C=S.C(R×S)等价的SQL语句是A.SELECT*FROM
设有关系R(A,B,C)和S(C,D)。与关系代数表达式πA,B,D(σR.C=S.C(R×S)等价的SQL语句是A.SELECT*FROM R,S WHERE R.C=S.CB.SELECT A,B,D FROM R,S WHERE R.C=S.CC.SELE4T 1,2,8 FROM R,S WHERE R=SD.SELECT A,B FROM R WHERE(SELECT D FROM S WHERE R.C=S.
A.SELECT*FROM R,S WHERE R.C=S.CB.SELECT A,B,D FROM R,S WHERE R.C=S.CC.SELE4T 1,2,8 FROM R,S WHERE R=SD.SELECT A,B FROM R WHERE(SELECT D FROM S WHERE R.C=S.
B.SELECT A,B,D FROM R,S WHERE R.C=S.CC.SELE4T 1,2,8 FROM R,S WHERE R=SD.SELECT A,B FROM R WHERE(SELECT D FROM S WHERE R.C=S.
C.SELE4T 1,2,8 FROM R,S WHERE R=SD.SELECT A,B FROM R WHERE(SELECT D FROM S WHERE R.C=S.
D.SELECT A,B FROM R WHERE(SELECT D FROM S WHERE R.C=S.
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