与客人谈话时精神集中，留心（），不得漫不经心，左顾右盼。
A.宾客吩咐
B.宾客神态
C.宾客语言
D.宾客动作
参考答案：A
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%.
测定砂的堆积密度时，出料口距容量筒的口不应超过（）mm。
A.100
B.50
C.80
D.60
