肺癌定位应()
A．尽量保护正常肺组织，脊髓受量越少越好
B．不必保护正常肺组织
C．不考虑脊髓受量
D．不必挡铅
E．不考虑病灶位置
参考答案：A
He is very humorous , so he often makes us _____. [ ]
A. laughing
B. to laugh
C. laugh
D. happily
经营定位的内部资源
