拉开三相单极隔离开关或配电变压器高压跌落式熔断器时，应先拉（）相。
A.左边；
B.中间；
C.右边；
D.电流较大的。
参考答案：B
客车给水作业要做到（）。
A.一接车、二给水、三整理、四送车
B.一提前、二接车、三送车、四整理
C.一提前、二接车、三给水、四送车
D.一提前、二接车、三给水、四整理
An analyst does research about market efficiency. Which of the following statements least likely explains why a market mispricing may persist（）
A. Arbitrage is encouraged to produce riskless profits.
B. A price discrepancy is insufficient large to leave the investor with a profit.
C. Short selling is limited or restricted.
