A company is determining the cost of debt to use in its weighted average cost of capital. It has recently issued a 10-year, 6 percent semiannual coupon bond for $ 864. The bond has a maturity value of $1 000. If the marginal tax rate is 35 percent, the cost of debt they should use in their calculation is closest to:（）

A. 4.3%.

B. 5.2%.

C. 6.1%.

发际高的病人一般以什么血管为蒂设计额正中皮瓣

A．颞浅动脉的额支

B．内眦动脉

C．内眦动脉及滑车上动脉

D．眶上动脉

E．滑车动脉