指出盲肠癌钡剂灌肠检查的错误表现()
A.盲肠内块影或充盈缺损
B.局部肠管痉挛和不充盈
C.肠套叠
D.粘膜纹中断破坏或分离
E.粘膜纹完整,盲肠压迹
参考答案:E
There are ten ______ rules in our class. [ ]
A. safe
B. safety
C. safely
D. safes
除去NaCl中混有的MgCl2、Na2SO4选用的化学药品是()
A.NaOH 和Ba(NO3)2
B.Ca(OH)2和AgNO3
C.NaOH和BaCl2
D.Na2CO3和BaCl2