单项选择题
A.0.5mm B.1mm C.1.5mm D.2mm
A.140±20 B.150±20 C.160±20 D.220±20
A.140±20 B.150±20 C.160±20 D.180±20
A.100kPa B.140kPa C.170kPa D.200kPa
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