皮皮学，免费搜题
登录
搜题
【单选题】
[§4] 设集合 A = {1 , 2 , 3 , 4 , 5 , 6 } 上的二元关系 R ={< a , b> ê a , b A , 且 a + b = 8} ,则 R 具有的性质为( ).A.
自反的
B.
对称的
C.
对称和传递的
D.
反自反和传递的
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】If you become ill after eating something that is harmless to most people, you may have an _____ to it.
【简答题】Have you ever been ill? When you are ill, you must be unhappy because your body becomes hot, and there are pains all over your body. You don’t want to work. Instead, you want to stay in bed, feeling ...
【简答题】典型数控车床的机械结构主要由哪几部分组成?
【单选题】对通货膨胀的衡量可以通过对一般物价水平上涨幅度的衡量来进行。一般说来,不是常用的指标是( )。
A.
零售物价指数
B.
生产者物价指数
C.
国民生产总值物价平减指数
D.
原材料物价指数
【简答题】Have you ever been ill? When you are ill, you must be unhappy because your body becomes hot, and there are pains all over your body. You don’t want to work, and you stay in bed, feeling very sad. What...
【简答题】Have you ever been ill? When you are ill, you must be unhappy because your body becomes hot, and there are pains all over your body. You don’t want to work, you stay in bed, feeling very sad. What mak...
【单选题】If your ______lively pets become passive, they might be ill.
A.
traditionally
B.
rarely
C.
normally
D.
continually
相关题目：
【单选题】对通货膨胀的衡量可以通过对一般物价水平上涨幅度的衡量来进行。一般说来,不是常用的指标是( )。
A.
零售物价指数
B.
生产者物价指数
C.
国民生产总值物价平减指数
D.
原材料物价指数