对于一种危害严重的疾病,采取针对病因的措施后,在评价其预防效果时应采用哪些指标最合适()
A.死亡率
B.发病率
C.患病率
D.病死率
E.罹患率
参考答案:B
―When was the house built?
―It was built in 1949 _______ the PRC was founded.
A.which
B.that
C.what
D.when
一般性的资金管理要领中,投资额应限定在全部资本的1/3至1/4以内为宜。( )