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【判断题】
运用年限法确定设备的率时,设备的已使用年限就是会计折旧年限。A.
正确
B.
错误
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【简答题】如何使三相异步电动机反转?反相运转与反接制动有何区别?
【单选题】Chinese historians tried to ______ a balance between the data of history and their significance.
A.
produce
B.
upset
C.
strike
D.
tip
【简答题】如何使三相异步电动机反转?
【简答题】旋转磁场的形成条件是什么?转动方向是由什么决定的?如何使三相异步电机反转?
【单选题】One of the most important results of research into ageing has been to pinpoint the significance of short-term memory. This faculty is easily (1)_____ as ageing advances. What seems to (2)_____ is that...
A.
discovered
B.
strengthened
C.
displayed
D.
disturbed
【单选题】One of the most important results of research into ageing has been to pinpoint the significance of short-term memory. This faculty is easily (1)_____ as ageing advances. What seems to (2)_____ is that...
A.
discovered
B.
strengthened
C.
displayed
D.
disturbed
【简答题】如何使三相异步电动机反转?
【简答题】6 如何使三相异步电动机反转?
【简答题】7 某绕线式三相异步电动机技术数据为:PN=60kW,nN=960r/min,E2N=200V,I2N=195A,λ=2.5。其拖动起重机主钩,当提升重物时电动机负载转矩TL=530N·m。 (1) 电动机工作在固有机械特性上提升该重物时,求电动机的转速; (2) 不考虑提升机构传动损耗,如果改变电源相序,下放该重物,下放速度是多少? (3) 若使下放速度为n=-280r/min,不改变电源相序,...
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