施工现场临时用电，进入开关箱的电源线，应采用（）。

A.焊接并绝缘包扎

B.插销连接

C.螺栓压接

D.都可以

Which of the following relationships between arbitrage and efficient markets is least accurate()

A. The concept of rationally priced financial instruments preventing arbitrage opportunities is the basis behind the no-arbitrage principle. 

B. Momentary deviations from market efficiency can create an arbitrage opportunity. 

C. Market efficiency refers to the low cost of trading derivatives because of the lower expense to traders.