Friday, September 16, 2022
Friday, September 16, 2022
Friday, September 16, 2022
液压马达是将:()A、液压能转换为机械能B、电能转换为液压能C、机械能转换为液压能D、电能转换为机械能...
Tuesday, December 6, 2022
交流电动机在基频以上调速时,定子电压不变,随着频率的增加,电动机...
Friday, September 16, 2022
和铸造相比,锻造工艺的不足之处是不能锻造外形和内腔复杂的工件。...
Friday, September 16, 2022
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Friday, September 16, 2022
Friday, September 16, 2022
变幅机构起、制动产生的冲击很大,为了减少冲击和振动,必须在变幅机...
Friday, September 16, 2022
Friday, September 16, 2022
Friday, September 16, 2022
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Friday, September 16, 2022
港口起重机械根据变幅方法可分为哪两种基本方式?装箱装卸桥的变幅机...
Tuesday, September 13, 2022
测量额定电压在500伏以下的设备或线路的绝缘电阻时,可选用()摇...
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直流接触器一般是()极的,也有小容量的直流接触器制成双极的。...
Friday, September 16, 2022
按照不同诊断目的和对象,选择最便于诊断的状态信号,通过传感器,数...
Friday, September 16, 2022
由流动液体的连续性方程可知:()。A、流速与通流截面积成正比B、流速与通流截面积成反比C、流速与通流截面积无D、流速与通流截面积平方成反比...
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