?? SI ??…???·?? B?1.2?
?? ??????? ???????????(SI)? ???????? ??? 16?? ??? ???? ????.
SI? 2?(????) ?????? B? ??? ????? ?????? ??? ?? 1,2?? 16?? ??? ??? ????.
??? ??? ???(??)? ??? ???, ???(??), ???(??) ? ??? 4?? ???? ???? ‘?? 4??(Fab Four)’? ??, ??? ???.
?? SI? ??? ??, ???? ???, ???? ??? ? ??? ??? ??? ?????? ???? ‘?? ??? ??? ??? ???? ??? ???? ???? ??? 16?? ?? ?’?? ????.
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