侧式搅拌器叶轮中心线小于油面（）时不能运行。
A、1m
B、3m
C、5m
D、6m
参考答案：B
队列研究最常见的偏倚是( )
A．混杂偏倚 B．信息偏倚 C．失访偏倚 D．选择偏倚
An analyst has gathered the following information about a company. The total asset turnover is 1.2. The after-tax profit margin is 10 percent. The financial leverage multiplier is 1.5. Given this information, the company’ s return on equity is:（）
A. 9%.
B. 18%.
C. 10%.
