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【单选题】
所谓两级控制 是指有一个中断允许总控位() ,配合各中断源的中断允许控制位共同实现对中断请求的控制。
A.
ET0
B.
IE
C.
EA
D.
EX0
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【判断题】电阻分相电动机主绕组和副绕组中的阻抗都是感性的,两相电流的相位差不可能达到 90 °电角度,而且其值也不大。( )
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