M? “s? tay” lô ?? t?i 123B – M?o soi c?u ch?t s? ?ánh b?ch th? c?ng ?n Quy lu?t ch?i x? s? 123B khá ??n gi?n. C??c th? ch? c?n ch?n m?t c?p s? ho?c m?t dãy s? t? m?t kho?ng giá tr? t? nhiên ?? ??t c??c. Industrial equipment demands a tr