6MV宽束X光子在吸收介质铅中的HVL是()mm?
A.16
B.16.9
C.16.6
D.19.9
E.19.6
参考答案:B
照样子写一写。
例:枝(树枝)→支(支出)
枫( )→____( ) 记( )→____( )
刘( )→____( ) 红( )→____( )
She___________ that it was a trick to get her involved in the matter, for she knew them so well.[ ]
A. doubted
B. suspected
C. conceived
D. distrusted