【简答题】自然垄断(Natural Monopoly)
【单选题】三相异步电动机转子的额定转速与同步转速、转差率之间的关系为()。
【简答题】自然垄断(natural monopoly)
【判断题】小型节日的节日流程不需要和大型节日一样繁琐和正规
【单选题】男性,23岁。反复高热3个月,经抗生素治疗无效。查体;贫血貌,浅表淋巴结未触及肿大,脾肋下3指。血象:WBC3.5×10 9 /L.Hb80g/L,血小板32×10 9 /L。骨髓象:分类不明细胞为5%.余未见异常。Hams试验阴性。腹部,胸部CT未发现深部淋巴结肿大。若该患者骨髓活检示:发现形态较一致、胞体大、有核仁的细胞,其免疫表型为CD30+、CD4+、CD8+、CD25-、CD68-。核型...
【单选题】三相异步电动机转子的额定转速与同步转速、转差率之间的关系为
【多选题】患者男性,67岁,因面色苍白伴头晕纳差乏力余年,加重伴浮肿一个月入院。10余年前无明显诱因发现面色苍白,后出现头晕乏力.纳差腹胀.消瘦。一个月前见双下肢浮肿,夜尿多,活动后心悸气促,无发热,尿量正常。无尿频尿急,无咳嗽.咳痰。大便成形,未留意过大便颜色。体检:T36.8℃,P100次/分,R24次/分,BP180/105mmHg,贫血貌,全身皮肤无黄染,淋巴结无肿大,双下肢皮肤散在出血点.淤斑,胸...
【单选题】A natural monopoly occurs when
A.
the product is sold in its natural state (such as water or diamonds).
B.
there are economies of scale over the relevant range of output.
C.
the firm is characterized by a rising marginal cost curve.
D.
production requires the use of free natural resources, such as water or air.
【简答题】A firm that is a natural monopoly will:A. attempt to break even, not profit-maximize. B. maximize profit by producing where MR = MC. C. face increasing costs of production. D. face greater market inst...
【单选题】三相异步电动机转子的额定转速N与同步转速N 0 、转差率S之间的关系为()。