贫铀弹中铀－235的浓度为_____。A.0.2%－0.3%B.0.71%C.2%－3%D.>90%

贫铀弹中铀-235的浓度为_____。

A.0.2%-0.3%

B.0.71%

C.2%-3%

D.>90%