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第 3 章 直流电机 书面 作业 - 2 1) 一台直流他励电动机额定数据为 : P N =27KW ,电压 U N =220V ,电流 I N =101A , n N =3000r/min, Ra=0.5 Ὼ 。试求: (1) 额定转矩 T N ; (2) 直接启动时的启动电流 I st ; (3) 如果要使启动电流不超过额定电流的 2 倍,求 Rst = ? T st = ? (4) 如果采用降压启动,启动电流仍限制为额定电流的 2 倍,电源电压应为多少?
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【单选题】The decrease in world food prices was a result of______.
A.
a sharp fall in the purchasing power of the consumers
B.
a sharp fall in the cost of food production
C.
the overproduction of food in the food-importing.
D.
the overproduction on the part of the main food-exporting countries.
【简答题】(adj.) : sharp in taste;sour;acid
【简答题】Sharp, sarcastic in speech (compound adj.) (a)词汇____
【简答题】Java 语言的的基本数据类型有哪些
【单选题】The decrease in world food prices was a result of______.
A.
a sharp fall in the purchasing power of the consumers
B.
a sharp fall in the cost of food production
C.
the overproduction on the part of the main food-exporting countries
D.
the overproduction of food in the food-importing countries
【简答题】adj. critical; bitter; sharp; acid
【简答题】The decrease in world food price was a result of ________. A) a sharp fall in the purchasing power of the consumers B) a sharp fall in the cost of food production C) the overproduction of food in the ...
【简答题】(remarks) sharp and unkind. (adj.)
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