在7匝线圈中通以1000A电流检验一个长150mm，直径25mm的圆形实心

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问题单项选择题

在7匝线圈中通以1000A电流检验一个长150mm，直径25mm的圆形实心零件。其L/D值为（）

A．6；

B．7，500安匝；

C．2.14；

D．45，000安匝

答案

参考答案：A

单项选择题

All of the following are poor examples of supervisory responsibility EXCEPT:（）

A. Proper supervision is not exercised because the supervisor’s income is partially based on unsupervised or improper trading activity.

B. Poor procedures allow a portfolio manager to designate a trade to an account or portfolio after the outcome of the trade is known.

C. Incorporating a professional conduct evaluation as part of an employee’s performance review.

填空题

有红、黄、蓝三种颜色的旗帜各3面，在每种颜色的3面旗帜上分别标上号码1、2、3，现在从中任取三面，它们的颜色和号码均不相同的概率为 ______．