A.Alt+Esc B.Ctrl+esc C.Tab+Esc D.Shift十Esc
A.0Cr18Ni9 B.1Cr18Ni9Ti C.1Cr17Ni7 D.Cr18Ni11Nb
A.O.20 B.0.15 C.0.10 D.0.02
A. 只能读不能写 B. 能读也能写 C. 禁止读也禁止写 D. 能写但不能读