题目内容
他励直流电动机负载转矩不变,若电枢回路串电阻调速,其电枢电流变小()
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位能性恒转矩负载位于第一象限与第三象限内。
American foreign policy has been swinging between isolationism and inter-ventionism since World War II.
Pax America indicates American policy to create a world order dominated by the United States.
The founding of the North Atlantic Treaty Organization (NATO) in 1949 and the Warsaw Pact in 1955 split the world into two military blocs. And the Cold War began.
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