【单选题】【消耗次数：1】
下列说法中，不正确的是()。
①
蒂 当关闭计算机电源后，RAM中的程序和数据就消失了
②
软盘和硬盘上的数据均可由CPU直接存取
③
信息高速公路的英文缩写是NII
④
浮点数的取值范围是由阶码的位数决定的
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相关题目
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计算机内存由ROM和RAM组成，下面说法正确的是
①
ROM只能读信息，不能写；RAM不能读但能写
②
ROM既不可读，也不可写；RAM既可读也可写
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断电后ROM中的信息不清除，RAM中的信息会清除
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断电后ROM中的信息会清除，而RAM中的信息不清除
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计算机内存由ROM和RAM组成，下面说法正确的是
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ROM只能读信息，不能写 RAM不能读但能写
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ROM既不可读，也不可写；RAM既可读也可写
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断电后ROM中的信息会清除，而RAM中的信息不清除
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浮点数的表示范围和精度取决于（ ）。
①
阶码的位数和尾数的机器数形式
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阶码的机器数形式和尾数的位数
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阶码的位数和尾数的位数
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阶码的机器数形式和尾数的机器数形式
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