脑血栓形成急性期有效治疗方法是
A.3小时内用rt-PA
B.12小时内用rt-PA
C.罂粟碱
D.尼莫地平
E.低分子量肝素
参考答案:A
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 NPV and IRR. NPV IRR()①A. $883 15% ②B. $243 20% ③C. $883 20%
A. ①
B. ②
C. ③
凝汽器冷却水管在管板上的连接,通常采用较多的方法是()。
A.胀管法连接
B.密封圈连接
C.管环连接
D.焊接