单项选择题
A.9mm B.10mm C.11mm D.12mm
A.20kPa B.30kPa C.40kPa D.50kPa
A.125±10mm B.120±10mm C.125±5mm D.130±10mm
A.自动制动阀 B.单独制动阀 C.分配阀 D.中继阀
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