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【简答题】
在图6-55a所示的回路中，两液压缸两腔面积分别相等，液压缸Ⅰ的负载比液压缸Ⅱ大，如不考虑泄漏、摩擦等因素，试问： 1) 两液压缸是否先后动作?运动速度是否相等? 2) 如将回路中节流阀阀口全部打开，使该处压降为零，两液压缸的动作顺序及运动速度有何变化? 3) 如将回路中的节流阀改为调速阀，两液压缸的运动速度是否相等? 4) 如将节流阀或调速阀移置进油路上，如图6—55b所示，以上结论有何变化?
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