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【多选题】
轨道交通线路是城市轨道交通列车运行的基础，它的作用有（ ）。A.
引导机车车辆的运行
B.
直接承受机车车辆车轮的垂直力和水平力
C.
承受机车车辆弹簧震动而产生的冲击力
D.
承受车辆制动时产生的纵向力
E.
承受车辆摇晃或过曲线时产生的侧向推力
拍照语音搜题，微信中搜索"皮皮学"使用
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【单选题】Why does Lisa mention Thomas Edison?
A.
To talk about a world record.
B.
To prove Martin wrong.
C.
To explain American history.
D.
To highlight on the value of effort.
【简答题】某计算机的存储系统由 Cache 、主存和用于虚拟存储的磁盘组成。 CPU 总是从 Cache 中获取数据。若所访问的字在 Cache 中,则存取它只需要 20ns ,将所访问的字从主存装入 Cache 需要 60ns ,而将它从磁盘装入主存则需要 1200 m s 。假定 Cache 的命中率为 90% ,主存的命中率为 60% ,计算该系统访问一个字平均存取时间为( )ns。 特别注意:计...
【单选题】Why did the bank teller ask Lisa to identify herself?
A.
Because she didn't bring her checkbook with her.
B.
Because he had never seen Lisa before.
C.
Because he suspected that she had stolen the checkbook.
D.
Because she was an attractive woman.
【单选题】Why was Lisa embarrassed?
A.
Because she hadn’t been to England yet.
B.
Because she hadn’t watched any British movies.
C.
Because she didn't want to see people play around.
D.
Because she didn't like to speak with a British accent.
【单选题】Why is Hank going to Lisa's house?
A.
To attend a dance.
B.
To get some food.
C.
To see sick Lisa.
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