单项选择题
A.30%~40%DW B.15%~20%ΔS C.15%~20%DW D.30%~40%ΔS
A.0.115 B.0.120 C.0.130 D.0.160
A.10.5mm B.11.5mm C.12.15mm D.13.5mm
A.±1.5° B.±2.5° C.±3° D.±4°
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