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【单选题】
患者男性，59岁，声嘶伴咽部不适半年，痰中带血1个月。查体：甲状软骨膨大，右上颈部（Ⅱ区）可及大小约2cm×2.5cm固定包块，无压痛。既往否认结核病史。患者行颈部MRI提示肿瘤位于声门上区，并侵及会厌前间隙、左侧咽壁、会厌及甲状软骨，左侧声带固定，口咽及咽旁无侵犯，上颈可见多个肿大淋巴结。直接喉镜病检提示声门上分化鳞癌。其他辅助检查未见转移。若行常规术前放疗，则下面说法不正确的是（）。A.
照射靶区应包括肿瘤区+区域淋巴结引流区
B.
常规双侧水平野的上界平第一颈椎水平，下界为环状软骨下缘，前界为颈前缘，后界应为棘突后缘
C.
必须行上、中颈淋巴结引流区照射，而下颈、锁骨上区不做预防照射
D.
DT40～50Gy时复查，如肿瘤消退满意可改行根治性放疗
E.
照射剂量接近36～40Gy时应避开颈段脊髓，颈后区辅以电子线照射补量
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【单选题】，是指公司每年支付固定的或者稳定增长的股利，将为投资者提供可预测的现金流量，减少管理层将资金转移到盈利能力差的项目的机会。
A.
固定股利政策
B.
固定股利支付率政策
C.
零股利政策
D.
剩余股利政策
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