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【多选题】
电压空间矢量PWM控制模式具有的特点包括( )。A.
输出电压高
B.
不能利用电压空间矢量直接生产三相PWM波
C.
可以合成任意的期望输出电压矢量
D.
旋转磁场越接近，功率器件开关频率越高
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【简答题】听一段材料，回答1-5小题 1.How old was Tom when he went on a holiday with his friends? A. He was 16. B. He was 17. C. He was 18. 2.Why did his mother ask his aunts, uncles and grandparents to write to him? A.She...
【简答题】I was standing in line behind a woman in her 60s. When it was her turn to pay, the shop owner2017年浙江金华语文中考试题完形填空 阅读下面短文，掌握其大意，然后从每题所给的A、B、C、D四个选项中选出最佳选项。 I was standing in line behind a woman in her 6...
【单选题】不属于原发性主动转运的物质是:
A.
肌浆网钙泵对钙离子的摄取
B.
各种细胞器膜、细胞膜上的氢泵
C.
钠-钾泵转运钠离子
D.
质子泵转运氢离子
E.
肾小管对葡萄糖的重吸收
【简答题】She didn’t know ________ to express herideas in English clearly in public. A) which B) why C) what D) how
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