【简答题】过去国内硫磺生产用催化剂品种单一,目前国内系列化催化剂品种有Al2O3,FeSO4/Al2O3, TiO2/Al2O3,TiO2,Co-Mo/Al2O3,PSR-31是一种()催化剂。(KHD://工艺基本知识th=150)
【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 ...
【单选题】已知在△ABC中,sinA:sinB:sinC=1:2:3,求a:b:c=( )
【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 ...
【简答题】以下程序功能是使用HashSet集合保存Student对象,如果Student对象的id相同,则认为是同一个对象。根据代码提示,补全(1)~(4)处的代码,并回答(5)~(6)处的问题。 上述程序中,HashSet集合hs存储的元素中,id为2的Student对象有(5)____________个。 若将上述第23行代码改为 return (this.id+this.name).equals(st...
【判断题】The speaker studied the lives of 1,000 women with a lot of free time.
【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)