单项选择题
A.25mm B.26mm C.28mm D.30mm
A.0.12mm B.0.10mm C.0.13mm D.0.09mm
A.调整阀柱塞 B.重联柱塞阀柱塞 C.缓解柱塞阀柱塞 D.副阀柱塞