28. What has happened to students these years according to the passage?
A. The students don't have to think anymore.n school.
B. The students use calculators in math class.
C.The students used to walk to school,but now they don't.
D.All of the above.
第1题:
第2题:
声明并创建一个学生类Student的对象s,下列语法格式正确的是()。
A.Student s = Student();
B.Student s;
C.Student s = new Student();
D.Student s = new ();
第3题:
【单选题】按照年龄的升序显示学生信息,正确的命令是?
A.db.students.find().sort({"age":1})
B.db.students.find().sort({"age":-1})
C.db.students.find().sort("age")
D.db.students.find().sort({"age":"asc"})
第4题:
第5题:
创建students对象,_______语句可以选出第二个同学的身高。 students数据如下: age height weight 1 19 170 68 2 20 165 65 3 18 175 65
A.students[1,'height']
B.students.loc[2,'height']
C.students.iloc[1, 1]
D.students['height'][3]
第6题:
创建students对象,_______语句可以选出第二个同学的身高。 students数据如下: age height weight 1 19 170 68 2 20 165 65 3 18 175 65
A.students.loc[2,'height']
B.students.iloc[1, 1]
C.students[1,'height']
D.students['height'][3]