实验结果： f=f+Uc0=(107.54±0.33)mm _Cc0×10%=031=×10%=0.31% Et 107.54实验结果： ( ) ( ) ( ) 100% 0.31% 107.54 0.331 100% 107.54 0.33 =  = =  = = + =  f U E f f U mm C f f C f