为了使扩大机能稳定运行，补偿绕组应调节到什么程度？
参考答案：
应该调节到欠补偿程度，使其在额定电流下，电机扩大机端电压与空载电压之差为额定电压的30%。
请用所给单词的适当形式填空。
1. A boy _____ (build) a model house this morning.
2. I enjoy _____ (fish) on Sundays.
3. Our favourite _____ (activity) are fishing,boating and skating.
4. Would you like _____ (go) fishing?
5. I have _____ (many) cards than you have.
7个月婴儿，体重5kg，腹壁皮下脂肪厚0.3 cm，不活泼，纳差，反复腹泻，面苍白，血红蛋白80g/ L，红细胞数3×1012/L，考虑为
A．营养不良Ⅰ度，缺铁性贫血B．营养不良Ⅱ度，巨幼细胞贫血C．营养不良Ⅲ度，巨幼细胞贫血D．营养不良Ⅲ度，缺铁性贫血E．营养不良Ⅱ度，缺铁性贫血
