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【单选题】
Python中布尔变量的值为
A.
真,假
B.
0,1
C.
T,F
D.
True,False
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参考答案:
举一反三
【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()。
A.
N=N0
B.
N=SN
C.
N=(1-S)N0
D.
N=(S-1)N0
【简答题】自然垄断(natural monopoly)
【判断题】在生物体内环境中,电子受体不一定是氧,只要它具有比电子供体较正的E0时呼吸作用就能进行。
A.
正确
B.
错误
【单选题】Which of the following is a characteristic of a natural monopoly?
A.
Marginal cost declines over large regions of output.
B.
Average total cost declines over large regions of output.
C.
The product sold is a natural resource such as diamonds or water.
D.
All of the above are correct.
【判断题】在生物体内环境中,电子受体不一定是氧,只要它具有相比电子供体的正E0时,呼吸作用就能进行。
A.
正确
B.
错误
【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...
A.
霍奇金病
B.
恶性组织细胞病
C.
外套组织细胞病
D.
间变性大细胞型淋巴瘤
E.
急性白血病
【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】a natural monopoly exists because:
A.
the government is the only supplier
B.
economic and technical conditions permit only one efficient supplier
C.
other firms are unable to enter the industy
D.
the firm owns natural resources
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