【单选题】本来是配对四格表卡方检验的资料,误作一般四格表卡方检验,则 ( )。
【单选题】Which of the following is true of perfectly competitive firms?
A.
For a perfectly competitive firm, as long as the price derived from expanded output exceeds the marginal cost of that output, the expansion of output creates additional economic profits.
B.
Producing at the profit-maximizing output level means that a firm is actually earning economic profits.
C.
A competitive firm earning zero economic profit will be unable to continue in operation over time.
D.
A perfectly competitive firm will operate in the short run only at price levels greater than or equal to average total costs.
【单选题】被普遍接受的观点认为,最好在估计出现功能障碍之前就开始康复治疗,即所谓()。总之,临床医学治疗越合理,越有利于康复过程;康复治疗越在早期进行,就越可促进整体及早恢复。
【单选题】本来是配对四格表卡方检验的资料,误作一般四格表卡方检验,则( )。
A.
本 来差别无显著性,可能判断为差别有显著性;
B.
本 来差别有显著性,可能判断为差别无显著性;
【单选题】若需求曲线为向右下倾斜一直线,则当价格从高到低不断下降时,卖者的总收益
【判断题】车刀的前角、后角和主偏角选得太小,会使工件的尺寸精度达不到要求。( ) 答案:
【判断题】熔断器的额定电流就是熔断器在规定条件下能分断的最大电流。
【单选题】Why will business transformation remain a buzzword of the moment?
A.
Because channel firms of all stripes continue to assess the direction of their companies in the age of cloud computing, mobility, managed services, big data, social median and other market and technology forces.
B.
Because each segment of this technology framework has contributed to economic growth and the well being of society.
C.
Because the magnificent advances in medicine, transportation, safety, manufacturing, agriculture, media and communication are almost difficult to comprehend.
D.
Because globalization, driven largely by technology, becomes ever more pervasive and influential with each passing year.