推荐回答（2个）
2、升降台的作用
升降台在剧场中的作用大致如下：
①快速迁换布景 在舞台主表演区布置的主升降台主要用来快速迁换布景。典型的以”品”字形布置的歌、舞剧院舞台中，升降台与侧车台和后车载转台一起进行整台或部分场景的快速转换。这种布置可以允许三台全布景的快速转换。
②满足舞台工艺布置的需要 以“品”字形布置的歌、舞剧院舞台中，在主舞台升降台的前、后、左、右常布置辅助升降台，侧、后辅助升降台用于侧车台和后车载转台的顺利开出，前辅助升降台则用于把后车载转台置于最靠近台口的位置。而在侧车台和后车载转台下面的补平升降台，则可在侧车台或后车载转台开出以后将台面补平，使整个台面不出现高差，以保证演职人员的安全。
③满足舞美设计和剧目编导人员的需要 在不同的剧目中，根据舞美设计和编导人员要求，可利用升降台不同的高度变化来改变舞台的形状，适应剧情对布景或场地的要求，以节省搭景消耗的人力、物力。利用升降台的倾斜装置形成倾斜台面，在各类演出中更好的突现透视效果等。
④根据剧情的需要，制造特殊的气氛和效果 自有舞台机械出现之日起哪怕是最简单的舞台机械，也常常参与表演活动，根据剧情的需要，制造出一些意外的气氛和效果。例如，利用升降台的低速下降表现大海的沉船，利用升降台上的活门和演员升降台表现人员的突然消失和出现等。
⑤根据不同表演流派的需求，改变舞台的形式 例如，利用乐池升降台可把镜框式舞台与大台唇甚至伸出式舞台结合起来，在实验剧场中，利用升降台可使剧场具有尽端式舞台、伸出式舞台、岛式舞台、中间式舞台、T形舞台或大厅等多种形式。
⑥利用升降台作为储存演出用台毯、软景片等的工具 某些剧院中，在舞台的适当位置常设有软景库升降台用于台毯、软景片的储存。
⑦利用升降台作为垂直运输货物的工具 很多剧场的主舞台后部或侧舞台的端部，设有布景集装箱运输升降台，用于垂直地将物品从地面运输到某指定位置甚至舞台平面。乐池升降台也经常用来运输活动座椅等。 3、升降台的布置与尺寸
对箱形镜框式舞台而言，主舞台升降台的布置常与舞台表演区相吻合，不同剧种需要不同大小的表演区，通常主舞台升降台要覆盖表演区和远景区。根据舞台工艺布置的要求，有侧舞台并设置侧车台时，在相应的位置设置相应的辅助升降台和补平升降台，有后舞台并设置车载转台时，根据需要在相应位置设置前、后辅助升降台和补平升降台。
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