A、主要输入区
B、编辑键区
C、小键盘区
D、功能键区
A)台式PC机键盘的按键数目现在已超过100个键,笔记本电脑受到体积的限制,按键数目仅为80多个
B)目前普遍使用的键盘按键都是电容式的,它的优点是击键声音小,无接触,不存在磨损和接触不良问题
C)PC机键盘向PC机输入的是8位串行的ASCⅡ码
D)PC机键盘中包含有一个单片机,它负责键盘扫描、消除抖动、生成代码并进行并/串转换,然后将串行数据送往主机
翻译下面关于洪特规则的描述 Hund's rule of maximum multiplicity is a rule based on observation of atomic spectra, which is used to predict the ground state of an atom or molecule with one or more open electronic shells. The rule states that for a given electron configuration, the lowest energy term is the one with the greatest value of spin multiplicity. This implies that if two or more orbitals of equal energy are available, electrons will occupy them singly before filling them in pairs. The rule, discovered by Friedrich Hund in 1925, is of important use in atomic chemistry, spectroscopy, and quantum chemistry, and is often abbreviated to Hund's rule.
如图所示,两个电容器和,串联后与电源连接,则( )A、上的电荷量大于上的电荷量 B、上的电荷量小于上的电荷量 C、上的电荷量等于上的电荷量 D、 电容器组的电容大于或
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