单项选择题
A.集尘盒 B.伞杆 C.集尘伞 D.橡胶垫
A.950mm B.980mm C.1020mm D.1102±10mm
A.总风缸 B.均衡风缸 C.列车管 D.作用管
A.57T B.23U C.62L D.101T
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