电动夹轨器的弹簧因疲劳而张力过大时，弹簧应报废。
参考答案：错
解析：疲劳时张力过小，而不是过大
During a period of rising prices a company may change from LIFO to FIFO to:（）
A. takes advantage of tax deferrals and reduce overall taxes paid.
B. increase COGS and, hence, increase the overall cash flow position of the firm.
C. increase reported inventory and, hence, improve various accounting constructs such as working capital
在同杆架设的多层电力线路上挂接地线时应（）。
A、先挂低压后挂高压
B、先挂高压后挂低压
C、不分先后
