单项选择题
A.25~30 B.21~26 C.22~28 D.18~23
A.0.45±0.05Mpa B.0.55±0.05Mpa C.0.65±0.05Mpa D.0.35±0.05Mpa
A.1 B.2 C.3 D.4
A.0.5mm B.0.8mm C.1.5mm D.1mm
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