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【单选题】
V-M 直流调速系统中采用了电抗器来抑制电流脉动,改善( )问题A.
低速时的谐波
B.
功率因数
C.
轻载时电流断续
D.
电流过大
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反馈参考答案：
举一反三
【判断题】A 38-year-old woman has had a feeling of fullness in her neck for the past year. She is otherwise asymptomatic. Her physician's assistant palpates an enlarged but nontender thyroid gland. She has no d...
A.
正确
B.
错误
【简答题】草图绘制工具——剪裁实体分为草图绘制工具——剪裁实体分为( )、( )、( )、( )及剪裁到最近端等五种类型。
【单选题】A 79-year-old woman has had increasing malaise and a 5-kg weight loss over the past 5 months. She has had a chronic nonproductive cough for 3 months. On physical examination she has no abnormal findin...
A.
Adenocarcinoma
B.
Granulomatous inflammation
C.
Necrotizing vasculitis
D.
Organizing abscess
E.
Silica crystals
【单选题】A 38-year-old woman has had a feeling of fullness in her neck for the past year. She is otherwise asymptomatic. Her physician's assistant palpates an enlarged but nontender thyroid gland. She has no d...
A.
Graves disease
B.
Nodular goiter
C.
Hashimoto thyroiditis
D.
Anaplastic carcinoma
E.
Follicular adenoma
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