食品添加剂
Which of the following could the system administrator use to assist in debugging boot problems after the system is up？（） ["SMS","alog","fsck","bosboot"]
关于石化行业常用的不同价格体系下产品体系价的说法，正确的是（）。 ["不同原油价格体系下的产品价格是按比例变化的","体系价格是基于历史价格的回归和外推得到的","不同企业可以有不同的体系价格","体系价格是为项目投资决策有统一客观标准，使同期、同类项目具有可比性","体系价格是可行性研究报告经济测算的基础价格"]
受检血浆凝血酶时间及蕲蛇酶时间皆延长则表明（） ["有肝素或类肝素物质存在","有FDP或异常纤维蛋白原存在","因子Ⅱ，V缺乏","因子X，Ⅶ，Ⅱ缺乏"]
Which of the following sequence of commands extracts the third image from a tape that was created using the backup command?（） ["tctl -f \/dev\/rmt0.1 fsf 2 ; tar -xv file3","tctl -f \/dev\/rmt0.0 fsf 3 ; dd if=file3 pf =\/dev\/mt0.1","tctl -f \/dev\/rmt0.1 fsf 2 ; dd if=\/dev\/rmt0.1 of=file3","tctl -f \/dev\/rmt0.0 fsf 3 ; dd if=\/dev\/rmt0.1 of=file3"]
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