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【单选题】
两有限长序列长度分别为 5和6,L点循环卷积等于线性卷积的条件是______。A.
L>=8
B.
L>=9
C.
L>=10
D.
L>=11
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【多选题】阅读材料回答题：曹某是某学校初中一年级的学生。一天下午，家长接到孩子打来的电话，叫家长马上到学校去一趟。家长来到学校后，班主任刘老师告知家长：班里进行了一次投票，曹某和另外一名学生被同学选为最差的学生；班主任让家长来，就是想叫家长赶紧想办法把曹某转走。事后，曹某留下一封信后离校出走了。 下列有关刘老师的做法叙述错误的是（ ）。 查看材料
A.
体现了班级管理的民主性原则
B.
伤害了学生的自尊心
C.
没有充分了解学生的自身情况
D.
违反了《中华人民共和国教育法》的相关规定
E.
体现了家庭和学校相互协调的原则
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【单选题】Notice Dear teachers and students, Since the day after tomorrow is New Year’s Day, we’ll have a party to celebrate it tonight. It will be held in the hall and we hope all of you can join us. We promis...
A.
school newspaper
B.
magazine
C.
TV advertisement
D.
text book
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