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【简答题】
已知 是等差数列，且 ，则 （ ）。
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举一反三
【单选题】Section A Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the ...
A.
It takes her long time to be there.
B.
She must have her car repaired.
C.
She must finish something by herself.
D.
She can not find a garage.
【单选题】Section A Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the ...
A.
1:50.
B.
1:55.
C.
2:00.
D.
2:05.
【单选题】Section A Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the ...
A.
1:50.
B.
1:55.
C.
2:00.
D.
2:05.
【简答题】如图，已知∠1=∠2，∠B=∠C。 求证：（1）CE∥BF； （2）∠B=∠3； （3）∠A=∠D。
【单选题】已知有如下代码: import java.util.*; public class Test{ public static void main(String[] args) { // 创建一个集合对象 Set set=new HashSet(); for(int i=0;i{ private String name; private String gender; public Student(St...
A.
编译成功，运行成功，运行结果： [学生0,男]
B.
编译成功，运行成功，运行结果： [学生4,男]
C.
编译成功，运行成功，结果输出的顺序可能是无序。
D.
编译成功，运行成功，运行结果是： [学生0,男, 学生3,女, 学生2,男, 学生1,女, 学生4,男]
【简答题】4 已知A=(1，2，3)，B=(2，3，1)，C=(3，1，2)，求A·(B×C)和A×(B×C)
【判断题】The speaker lived with students from different countries when she studied in the UK.
A.
正确
B.
错误
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