He didn't go home _______ he finished his homework. [ ]
A. when
B. if
C. until
D. that
答案:C
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↑
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%.