滚动游承的游隙是指轴承的套圈同时沿径向或轴向的最大活动量。
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电声教材有哪些基本的类型?为什么说录音教材是电声教材的基础?
In snall angle stability, when external forces exist , the buoyant force is assumed to act vertically upwards through the center of buoyancy and through the().
A. center of gravity
B. center of flotation
C. metacenter
D. metacentric height