单项选择题
A.0.1mm B.0.15mm C.0.20mm D.0.25mm
A.10～15mm B.15~20mm C.20~25mm D.25~30mm
A.819~890mm B.825～890mm C.835~890mm D.840～890mm
A.350kPa B.400kPa C.450kPa D.500kPa
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