【填空题】一个类实现某个接口时必须实现接口中声明的所有方法,否则该类必须定义为(__);

【单选题】若有定义int a = 2;则执行完语句a += a -= a * a; 后,a的值是( )

【填空题】一个完整的URL地址由(__),(__)端口和文件四部分组成;

【填空题】Java将运行错误分为两类:(__)和(__), 其对应的类均派生自(__)类;

【单选题】厂用高压变压器系统接地电流小于10A,高压变压器的中性点运行方式应采用()

【单选题】在 10KV 出线上 , 电流互感器通常 ( ) 。

【判断题】水平方向布置的三相平行导体在发生三相短路时 , 最大电动力出现在 A 相。 ( )

【填空题】在Java语言中,逻辑常量只有true和(__)两个值;

【单选题】公开密钥密码体制中,加密模式下加密密钥即( )。

【多选题】世界各国立法的基本原则有()。

【单选题】下列程序段执行后t1的结果是( )。int x1 = 9, x2 = 6, t1; t1 = x1 > x2 ? x1 : x2;

【单选题】锅炉给水泵属于( )负荷?

【填空题】listening unit test 1-5 Unit 7 满分: 10 分 Part I Directions: In this section, you’ll hear some passages. At the end of each passage, you'll hear some questions. Both the passage and the questions will be spoken only once. After each question, choose the best answer from the four choices marked A, B, C, and D. Questions 1 to 4 are based on the passages you have just heard. 1 ) A . Doing a business. B . Signing a contract. C . Making a travel. D . Starting a new trade. 2 ) A . Receiving a diamond ring. B . Getting a bunch of flowers. C . Obtaining a large amount of money. D . Receiving a new house. 3 ) A . Have the ceremony in a church. B . Get married in a scenic spot. C . Have the ceremony while riding on horseback. D . Have the ceremony in a hotel. 4 ) A . The style of colors, decorations and music. B . The bride wears a long white wedding dress. C . The wedding places and the clothes for the guests. D . The way of inviting friends to the ceremony. Questions 5 to 7 are based on the passages you have just heard. 5 ) A . All those who get on well with each other are friends. B . Friends are closer than people who just get on well with each other. C . Everyone understands clearly how to make friends. D . Factors like age and background aren’t important in friendship. 6 ) A . Even friends may have differences of opinions. B . Supporting and understanding in friendship results from shared background. C . It generally takes time for people to become close friends. D . Someone’s habits may annoy his or her friends. 7 ) A . They must hold a ceremony to create a powerful bond. B . They have to eliminate differences in background. C . They should make friends with those who are of same age and race. D . They should support and understand each other. Part II Directions: In this section, you will hear some news reports. At the end of each news report, you will hear some questions. Both the news and the question will be spoken only once. After each question, Choose the best answer from the four choices marked A, B, C, and D. Questions 8 to 10 are based on the passages you have just heard. 8 ) A . Intelligent and educated. B . Sociability and good cook. C . Dependable character. D . Mutual attraction and love. 9 ) A . 17th place. B . 20th place. C . Last place. D . 12th place. 10 ) A . Someone who is well educated and a good cook. B . Someone who is good at housekeeping and cooking. C . Someone who can share the financial burden. D . Someone who has a good appearance.

【单选题】方法的作用不包含:( )

【判断题】构造函数的方法名可以由编程人员任意命名。

【多选题】以下属于正确的java注释有

【判断题】Java语言是编译解释型语言

【多选题】已知如下定义:String s = “story”, 下面哪个表达式是合法的:

【单选题】以下属于大电商平台生鲜频道的是().

【单选题】以下属于垂直生鲜电商平台的是()。

【填空题】Java语言中提供的GUI功能主要由java.awt包和(__)包中的类和接口实现;

【判断题】一个Java类可以有一个直接父类,并可以实现多个接口。

【单选题】设 x,y 均为已定义的类名,下列声明对象x1的语句中正确的是( )

【判断题】在 330kV 及以下发电厂和变电所中一般选用三相式变压器。 ( )

【填空题】Java采用(__)编码的字符集,其字符类型占用 (__)字节内存空间。

【判断题】Java中,一个类可以有多个直接父类

【填空题】面向对象程序的主要特征:继承,(__),(__);

【单选题】能够实现对原文的鉴别和不可否认性的认证技术是( )。

【单选题】设有定义语句int a[]={66,88,99}; 则以下对此语句的叙述错误的是( )。

【多选题】如下哪些是Java中有效的关键字()

【单选题】结合了不同类型的防火墙特点的是( )。

【单选题】既能发电 , 又能储存能量的是 ( ) 。

【单选题】1000MW发电机组厂用电高压系统额定电压采用()

【单选题】以下( )是正确的域名体系结构。

【单选题】互联网的基本特征不包括( )

【多选题】下面句话是正确的(AD)

【单选题】如何强制垃圾回收一个对象?

【填空题】定义类的保留字是(__)定义接口的保留字是(__);

【判断题】不论是否捕捉到异常try{}catch ){} finaly{}语句中finally块中的代码总要被执行。

【单选题】为了区分重载多态中同名的不同方法,要求( )

【填空题】Java程序结构分为(__),(__)和(__)三种;

【单选题】为了使包sos在当前程序中可见,可以使用的语句是( )

【单选题】具有防暴反劫功能的是()

【单选题】符合对象和类关系的是:

【单选题】以下选项中,合法的赋值语句是( )

【单选题】以下()是规范交易主体的有关法律。

【判断题】Java的源代码中定义几个类,编译结果就生成几个以“.class”后缀的字节码。

【单选题】定义主类的类头时可以使用的访问控制符是( )

【判断题】Java支持多重继承。

【判断题】Unicode码与ASCII码相同。