怎样区别Ns云与St云？

A.Ns Sc As St

B.Sc As Cs Fs

C.Ci Cs As Ns

D.Fs Ns As St

A.Ns Fc St

B.St Fs Cu

C.Fn St Fs

D.Fs Ns Fn

A.Ci，Cu，St

B.As，St，CsC.St，Cu，Ns

C.Ac，Cc，Cb

A、Ci，Cu，St

B、As，St，Cs

C、St，Cu，Ns

D、Cu，Cb

A.Ci→Cs→As→Sc

B.Ci→Cs→As→Ns

C.Ci→Cs→As→St

D.Ns→As→Cs→Ci

A.Ci ，Cs，As，Ns

B.Ci ，Cs，Ac，St

C.Cu，TCu，Cb，Cc