单项选择题
A.600N/m B.620N/m C.640N/m D.660N/m
A.密封胶 B.凡士林 C.NBU30PTM D.267
A.35N/m B.36N/m C.37N/m D.38N/m
A.150mm B.250mm C.200mm D.100mm
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