99Tcm-MIBI中锝的价态是（）。
A.0价
B.+1价
C.+3价
D.+4价
E.+5价
参考答案：B
《秘传眼科龙木论》成书于
A．隋代B．唐代C．宋代D．元代E．明代
Depression is the leading cause of suicide, __ __ in turn is the third leading cause of death among 15 to 24 year olds in the United States．
A．who
B．which
C．that
D．what
