中医治则为：
A．养肺阴降火
B．补肾阴降火
C．补气养阴
D．补气养血
E．滋阴降火，养血润燥
参考答案：E
下列物质中，属于氧化物的是
A．水
B．氧气
C．锰酸钾
D．氯化钙
A company is considering the purchase of a copier that costs $ 5000. Assume a cost of capital of 10 percent and the following cash flow schedule: Year 1: $ 3000 Year 2: $ 2000 Year 3: $ 2000 Determine the project’s payback period and discounted payback period. Payback Period Discounted Payback Period （）①A. 2.0 years 1.6 years②B. 2.4 years 2.4 years③C. 2.0 years 2.4 years
A. ①
B. ②
C. ③
