A.52 B.20 C.2a D.210
A.\r B.\n C.\b D.\t
A.(x>=y)&&(y>=z) B.(x>=y)AND(y>=z) C.(x>=y>=z) D.(x>=y)&(y>=z)
A.write(buffer,size,count,fp) B.fprinff(buffer,size,count,fp) C.fwrite(buffer,size,count,fp) D.fwrite(buffer,size,count,p)
A.8 B.12 C.13 D.15