few.a few.little.a little的区别和联系: few / a few(形容词)用来修饰可数名词,few表示否定意义,没有,几乎没有, a few表示有肯定意思,有几个. 例如:a few people/few people有几个人/没有几个人He has few friends here,he feels lonely.他这里没朋友,他感觉寂寞.There are a few eggs in the basket.篮子里有几个鸡蛋. little / a little(形容词…
英语中并没有allow to do sth这种结构,只有allow doing sth 及allow sb to do sth这两个结构. 你这样记忆可能方便一些: 1. 在主动语态中,如果allow后面没有sb出现在allow后面的话,就要接动名词形式:如果后面有sb做宾语,则必须要接to do sth. 2. 在被动语态中,只有be allowed to do sth的句式结构,而没有sb be allowed doing sth. 即: 1.allow sb to do sth,allow…
[转]C#接口-显式接口和隐式接口的实现 C#中对于接口的实现方式有隐式接口和显式接口两种: 类和接口都能调用到,事实上这就是“隐式接口实现”. 那么“显示接口实现”是神马模样呢? interface IAnimal { void Dog(); } class Animal:IAnimal { void IAnimal.Dog() { Console.WriteLine("dog..."); } } //只能通过接口调用 IAnimal animal = new Animal(); a…
前几天去面试了一家公司,整下改公司的面试题. 1.新的 HTML5 文档类型和字符集是? HTML5 文档类型很简单: <!doctype html> HTML5 使用 UTF-8 编码示例: <meta charset="UTF-8"> 2.HTML5 中如何嵌入音频? 当前,audio 元素支持三种音频格式:…
转载: C#中对于接口的实现方式有隐式接口和显式接口两种: 隐式地实现接口成员创建一个接口,IChinese,包含一个成员 Speak;我们创建一个类Speaker,实现接口Chinese //隐藏式实现例子 public interface IChinese { string Speak(); } public class Speaker : IChinese { public string Speak() { return "中文"; } } 这个就是隐式实现接口. 隐式实现调用方…
Linux版本的搜狗输入法经常崩溃,无法输入中文,今天作下记录,环境:Ubuntu14.04 64位 1.安装和卸载 Linux搜狗是基于框架fcitx的,先得安装框架Ubunt安装搜狗方法 也可以直接apt-get install fcitx,然后安装sogoupinyin的deb包 卸载输入法和框架: apt-get purge sogoupinyin,apt-get purge fcitx, apt-get autoremove fcitx 2.配置 使用fcit框架: system se…
5.MySQL常用函数 5.1合计/统计函数 5.1.1合计函数-count count 返回行的总数 Select count(*)|count (列名) from table_name [WHERE where_definition] 练习 -- 统计一个班级共有几个学生 SELECT COUNT(*) FROM student -- 统计数学成绩大于90的学生有多少个 SELECT COUNT(*) FROM student WHERE math > 90 -- 统计总分大于250的人数有…
Text I had an amusing experience last year. After I had left a small village in the south of France. I drove on to the next town. On the way, a young man waved to me. I stopped and he asked me for a lift. As soon as he got into the car, I said good m…
nltk安装完毕后,编写如下示例程序并运行,报Resource u'tokenizers/punkt/english.pickle' not found错误 import nltk sentence = """At eight o'clock on Thursday morning Arthur didn't feel very good.""" tokens = nltk.word_tokenize(sentence) print(tokens…
Given a non-empty string containing an out-of-order English representation of digits 0-9, output the digits in ascending order. Note: Input contains only lowercase English letters. Input is guaranteed to be valid and can be transformed to its origina…