迟缓率是衡量调速系统质量的重要指标之一,一般要求ε=3%~6%。
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At all angles of inclination,the metacenter is().
A. vertically above the center of buoyancy
B. vertically above the center of gravity
C. at the intersection of the upright vertical centerline and the line of action of the buoyant force
D. at the geometric center of the underwater volume
电接点或水位计使用,发现测量筒中无水时个别发光管还显示绿色,我们应考虑出现什么故障?如果有水时个别发光管还显示红色呢?