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问题 选择题

He didn't go home _______ he finished his homework. [ ]

A. when

B. if

C. until

D. that

答案

答案：C

选择题

有元素化合价升降的反应是氧化还原反应．下列属于氧化还原反应的是（　　）

A．CaCO3

 高温 
.
 
CaO+CO2↑

B．HCl+KOH═KCl+H2O

C．SO2+2NaOH═Na2SO3+H2O

D．2Na+2H20═2NaOH+H2↑
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单项选择题

A company is planning a $50 million expansion. The expansion is to be financed by selling $20 million in new debt and $30 million in new common stock. The before-tax required return on debt is 9 percent and 14 percent for equity. If the company is in the 40 percent tax bracket, what is the marginal weighted average cost of capital（）

A. 10.6%.

B. 9.0%.

C. 10.0%.
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