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案例分析题The successful spread of a virus depends on how long it can （） unnoticed, before its presence is made known by the activation of side-effects. For example, many viruses （） their code to avoid recognition. The successful spread of a virus depends on how long it can （） unnoticed, before its presence is made known by the activation of side-effects.
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案例分析题When you open a file or run a program in a computer, a window appears on the desktop of your computer. The （） of the window indicates which program you are currently working in arid its color will become blue if a window is active. When you click on The （） , the window disappears and appears as a button on the taskbar. Clicking on a button in （） will invoke a specific command. The （） of the window indicates which program you are currently working in arid its color will become blue if a window is active.
在网络互联设备中，连接两个同类型的网络需要用 (62) 。
下列各数中最小的是（）
最后交易日是指某种期货合约在合约交割月份中进行交易的最后一个交易日，过了这个期限的未平仓期货合约，必须进行实物交割。( )
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