A.变压器可以改变直流电压
B.变压器是根据电磁感应原理工作的
C.变压器可以把其它形式的能转化为电能
D.降压变压器的次级线圈的匝数比初级多
答案:B
Which of the following statements about efficient markets and indexes is FALSE()
A. An unweighted index assumes that investors make and maintain an equal dollar investment in each stock in the index.
B. External efficiency means prices adjust rapidly to new information.
C. Efficient markets tests have found that stocks with high price-to-earnings ratios (P/E) tend to outperform stocks with low P/E ratios.
下列关于司法拘留、行政拘留与刑事拘留的表述,哪一项是正确的( )
A.司法拘留是对妨害诉讼的强制措施,行政拘留是行政制裁方法,被司法拘留和行政拘留的人均羁押在行政拘留所;刑事拘留是一种强制措施,被刑事拘留的人羁押在看守所
B.司法拘留、行政拘留、刑事拘留都是一种处罚手段
C.司法拘留、行政拘留、刑事拘留都是一种强制措施
D.司法拘留、行政拘留、刑事拘留均可由公安机关决定