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【单选题】
用幂级数求解齐次线性微分方程时，对它的通解以下描述正确的是A.
通解可以是两个特解的线性组合，其中组合系数为任意常数
B.
通含有一个任意常数
C.
通解可以是两个解的线性叠加而成，只要其中一个叠加系数为任意常数即可
D.
通解形式具有多样性
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举一反三
【单选题】－Have you ever seen the film 'The Founding of A Republic'? －______ . However, I hear there are many stars in it.
A.
Yes, I’ve seen it once.
B.
Yes, I have ever.
C.
Not exactly. Is it good?
D.
Never. I have no time.
【简答题】. ----Have you ever seen the film “The Founding of the Republic”? ----___________. However, I hear there are many stars in it.A. Yes, I’ve seen it once. B. Yes, I have ever. C. Not exactly. Is it good...
【简答题】阅读理解 Have you ever asked your customers and potential customers how they'd like to hear from you?Some of them might check email messages regularly throughout the day; some of them might check their me...
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