第4题: [单项选择]P60-12#提速道岔防松螺母的安装标准是()。 A. 先紧固内螺母,使其达到标准扭矩,再紧固外螺母。使外螺母与内螺母基本密靠 B. 先紧固内螺母,再紧固外螺母,使其达到标准扭矩 C. 先紧固内螺母,使其达到标准扭矩,再紧固外螺母,并使其达到标准扭矩 D. 内螺母和外螺母同时紧固并使其达到标准扭矩 参考答案:A
第18题:[单选题] The main cause of fluctuations in stock prices is changes in A. tax laws. B. errors in technical stock analysis. C. daily trading volume in stock markets. D. information available to investors. E. total household wealth in the economy. 参考答案:D