皮带输送机电动机振动大的原因是（）。 ["风扇损坏造成风扇机械不平衡","基础不稳固或地脚螺丝松动","接手不正","皮带负荷过大"]
You are the administrator of Company’s network. Your Windows 2000 Professional computer has a Pentium II 400-HHz processor, 128 MB of RAM, and IDE hard disk. After installing a new digital imaging application you notice that your computer is responding very slowly and you are experiencing delays in processing graphics files. You use System Monitor to view your computer’s performance as shown in the Performance window. What should you do? （） ["Lower the Processor Priority level for all applications except the digital imaging application.","Replace the CPU with a faster performance processor.","Install a second hard disk. Move the paging file to the new hard disk.","Increase the physical RAM in the computer to 256 MB or more.","Install a new disk drive controller."]
纯净的SF6气体是否有毒？
列车遇有高架站台停车时，乘务员禁止站在（），必须背靠车体立岗，防止人多拥挤被挤下站台。 ["渡板上","车梯上","两节车厢连接处"]
（）是探求新知的开始，也是探求新知的动力；进一步说，是创新的开始，也是创新的动力。不断发现问题，提出问题是一个人思维活跃、善于思考的表现。 ["质疑","探索","思考"]
叙事学
