在X线对周围型肺癌的诊断中,哪一项诊断意义最大()
A.空洞
B.钙化
C.无卫星病灶
D.肺门或纵隔淋巴结肿大
E.肿块有分叶和毛刺
参考答案:E
一组数据0,1,2,3,4的方差是______.
The teacher _____ that the pupils finish their compositions at once.
A.described
B.desired
C.delighted
D.determined