-3-6+9-11+2.
-3-6+9-11+2=0-11+2=-9.
There are some flowers on _____ desk. [ ]
A. Mr. Li
B. Mrs. Wangs
C. Miss Smith's
D. she's
CT扫描示主动脉弓左侧圆形结节影,向足侧连续多个层面均可见有明显增强,提示为()
A.左侧膈神经
B.永存左上腔静脉
C.主动脉弓旁淋巴结
D.左上肺动脉
E.左上肺静脉