工程经济分析的一般过程是()。 ①确定目标 ②调查研究收集资料 ③趋势分析 ④建立和选择方案 ⑤构造和选择模型 ⑥模型求解 ⑦综合评价 ⑧选择最有方案 ⑨完善实施方案 ["①→②→③→④→⑤→⑥→⑦→⑧→⑨","①→②→③→⑥→⑤→④→⑨→⑧→⑦","②→①→③→⑤→④→⑥→⑧→⑦→⑨","①→②→⑨→⑤→⑥→④→⑦→⑧→③"]
A network administrator needs to allow only one Telnet connection to a router. For anyone viewing the configuration and issuing the show run command, the password for Telnet access should be encrypted. Which set of commands will accomplish this task?() ["

","

","

","

"]
致突变、致畸效应和致癌效应的基本概念化学致畸作用原理。
肉制品之磷酸盐用量以磷酸根(Phosphate)计每公斤不得超过多少公克()。 ["2","3","4","5"]
技术的规范性包括哪几个方面的内容?
倾角时差