单项选择题
A.3~3.5S B.6~7.5S C.10~11.5S D.19~20S
A.3~3.5S B.6~7.5S C.10~115S D.19~20s
A.引导螺母失效 B.调整螺母失效 C.膜板穿孔 D.皮碗破损
A.勾贝 B.引导螺母 C.调整螺母 D.调整弹簧
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