单项选择题
A.加常数 B.i角 C.倾斜
A.10° B.15° C.20° D.25°
A.23.4m,25.4m B.22.4m,24.4m,26.4m C.21m,23m,25m,27m D.22m,24m,26m
A.±1.89mm B.±2.39mm C.±2.56mm D.±0.86mm
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