java中声明和赋值语句是_以下选项中，合法的赋值语句是（）【单选题】具有防暴反劫功能的是()
【多选题】如下哪些是Java中有效的关键字()
【单选题】如何强制垃圾回收⼀个对象?
【单选题】⽅法的作⽤不包含:( )
【判断题】Java⽀持多重继承。
【单选题】既能发电 , ⼜能储存能量的是 ( ) 。
【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( )
【单选题】以下属于垂直⽣鲜电商平台的是()。
【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】以下属于⼤电商平台⽣鲜频道的是().
【单选题】公开密钥密码体制中，加密模式下加密密钥即( )。
【单选题】以下( )是正确的域名体系结构。
【填空题】Java程序结构分为(__),(__)和(__)三种;
【多选题】下⾯句话是正确的(AD)
【填空题】在Java语⾔中，逻辑常量只有true和(__)两个值;
【单选题】锅炉给⽔泵属于( )负荷?
【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( )。
【填空题】⼀个完整的URL地址由(__),(__)端⼝和⽂件四部分组成;
【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。
【填空题】⾯向对象程序的主要特征：继承,(__),(__);
【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】为了区分重载多态中同名的不同⽅法，要求( )
【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。 ( )
【判断题】构造函数的⽅法名可以由编程⼈员任意命名。
【单选题】定义主类的类头时可以使⽤的访问控制符是( )
【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。
【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】以下选项中，合法的赋值语句是( )
【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(__);
【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 . Signin
g 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.
【判断题】Java中,⼀个类可以有多个直接⽗类
【单选题】互联⽹的基本特征不包括( )
【单选题】以下()是规范交易主体的有关法律。
【多选题】以下属于正确的java注释有
【单选题】结合了不同类型的防⽕墙特点的是( )。
【单选题】1000MW发电机组⼚⽤电⾼压系统额定电压采⽤()
【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】Java语⾔是编译解释型语⾔
【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;
java源代码加密【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( )
【单选题】在 10KV 出线上 , 电流互感器通常 ( ) 。
【单选题】为了使包sos在当前程序中可见，可以使⽤的语句是( )
【多选题】世界各国⽴法的基本原则有()。
【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】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。
【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。
【判断题】Unicode码与ASCII码相同。
【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】符合对象和类关系的是:

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