选择题：4、在变压变频的交流调速系统中，给定积分器的作用是什么？
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7、低速大扭矩液压马达在结构形式上一般为 。 （ ）A、齿轮式 B、叶片式C、轴向柱塞式 D、径
8[翻译题,10分] 免责条款
8[翻译题,10分] 免责条款
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