The "New Stone Age" around 10,000 years ago saw the invention of metal tools and the wheel.
A: 正确
B: 错误
A: 正确
B: 错误
举一反三
- The "New Stone Age" around 10,000 years ago saw the invention of metal tools and the wheel.
- Stone tools began to be replaced around 6,000 years ago by metal tools, who were used to build instruments and simple machines.（） A: began B: who C: to build D: simple
- 下面If语句统计满足职称（用字符串变量duty表示）为副教授或教授、且年龄（用整型变量age表示）小于40岁条件的人数，正确的语句是______。 A: If age < 40 And （duty = "教授" or duty = "副教授"） Then n = n + 1 B: If age < 40 And duty = "教授" or duty = "副教授" Then n = n + 1 C: If age < 40 And duty = "教授" or "副教授" Then n = n + 1 D: If age < 40 Or duty = "教授" And duty = "副教授" Then n = n + 1
- 定义并初始化一个用于存放我们国家的四个直辖市的数组cityName，四个直辖市为：北京，上海，天津，重庆. 正确的是_________ A: String[] cityName=new String[4]{"北京","上海","天津","重庆"}; B: String[] cityName=new String[]{"北京","上海","天津","重庆"}; C: String[] cityName={"北京","上海","天津","重庆"}; D: String cityName = new String[4] { "北京", "上海", "天津", "重庆" };
- 新建一个流对象，下列（ ）选项的代码是错误的。 A: new BufferedWriter(new FileWriter("a.txt")); B: new BufferedReader(new FileInputStream("a.dat")); C: new DataOutputStream(new FileOutputStream("a.txt")); D: new ObjectInputStream(new FileInputStream("a.dat"));