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问题 单项选择题

发生重大动物传染病时，应掌握的防控原则是（）

A.早、快、严、小

B.早、快、准、小

C.快、早、严、小

D.严、快、早、小

E.早、急、严、小

答案

参考答案：A

多项选择题

溶剂法分离水溶性生物碱时，常用的溶剂有

A．丙酮

B．正丁醇

C．乙醇

D．醇
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单项选择题

A firm is considering a $200000 project that will last 3 years and has the following financial data : Annual after-tax cash flows are expected to be $90000. Target debt/equity ratio is 0. 4. Cost of equity is 14 percent. Cost of debt is 7 percent. Tax rate is 34 percent. Determine the project’s payback period and net present value(NPV). Payback Period NPV（） ①A. 2.43 years $18716 ②B. 2.22 years $18716 ③C. 2.43 years $21872

A. ①

B. ②

C. ③
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