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【多选题】
关于机械原理课程学习,下列说法错误的是A.
只需要看网络教学平台上的视频即可
B.
需要认真阅读每章节的图文内容，其中有各章节的重点内容和学习要求。
C.
看视频资料可代替本章节的图文资料学习
D.
通过视频资料可辅助理解学习本章节的学习内容，同时可和拓展学习，了解更多知识
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【单选题】设有关系 R 和 S ,在下列的关系运算中,( )运算不要求 R 和 S 具有相同的目数,也不要求对应属性的数据类型相同。
A.
R ∪ S
B.
R ∩ S
C.
R-S
D.
R × S
【简答题】任务型阅读.。 Everyone has got two personalities: one is shown to the world and the other is secret and real . You don’t show your secret personality when you are awake , but when you are asleep, your slee...
相关题目：
【单选题】设有关系 R 和 S ,在下列的关系运算中,( )运算不要求 R 和 S 具有相同的目数,也不要求对应属性的数据类型相同。
A.
R ∪ S
B.
R ∩ S
C.
R-S
D.
R × S