（）程序应永久保存在PLC中，不能因关机、停电而改变其内容。 A.系统 B.用户 C

背画10～220kV双母线出线线路一次接线图。

所有具有承销业务资格的证券公司都必须成立内核小组。（）

The company has a target capital structure of 40 percent debt and 60 percent equity. Bonds pay 10 percent coupon (semi-annual payout ), mature in 20 years, and sell for $849.54. The company stock beta is 1.2. Risk-free rate is 10 percent, and market risk premium is 5 percent. The company is a constant growth firm that just paid a dividend of $2.00, sells for $27.00 per share, and has a growth rate of 8 percent. The company’s marginal tax rate is 40 percent. The after-tax cost of debt is:（）

A. 8.0%.

B. 9.1%.

C. 7.2%.

手锤按其形状分为（）和方头。

冲压生产时，冲压工应注意些什么？