单项选择题
A.0.07~0.21r/min B.0.7~0.21r/min C.0.97~0.021r/min
A.±100° B.±110° C.±120°
A.25m B.30m C.35m
A.一排液柱轴承 B.二排液柱轴承 C.三排液柱轴承
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