尺寸参数一般依据设计任务书中的原始数据、方案设计时的总体布局图与同类机械的类比或通过分析计算确定,必要时经试验确定。
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机械的运动参数一般是指机械传动构件的转速及调速范围等。
A. 对
B. 错
动力参数一般指机械系统的动力源参数,如电动机、液压马达、内燃机的功率及其机械特性。
A. 对
B. 错
Sam is going to stay with his family during Christmas.
A. 对
B. 错
Sam received many handwritten cards from his friends all over the world.
A. 对
B. 错