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【单选题】
肺癌锁骨上野与纵隔野相邻时，下列哪项设计是正确的（）A.
锁骨上野与纵隔野共用一条分野线，不需间隔
B.
两野共用并拉开一定距离，使两照射野在50%等剂量深度相交
C.
两野可在相临处重叠0.5cm
D.
两野边界相接时，可用铅块挡掉一个照射野的扩散区，不需间隔
E.
两野可在相临处拉开2cm
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