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【多选题】
关于微分方程 y''+py'+qy=f(x) (其中p,q 是常数,f(x)是不恒为0的连续函数),下列说法正确的有( )。A.
这是一个系数非齐次线性方程
B.
根据6.5所学，这个方程的通解等于它的一个特解与对应的齐次方程的通解之和。
C.
用6.6所学的特征根方法，可求得对应齐次方程 y''+py'+qy=0 的通解。因此，求解原方程的关键在于求得它的一个特解。
D.
对于一般形式的 f(x), 这个方程的特解是很难确定的。但对于某些特殊情形的f(x)，可以用“待定系数法”求得方程的特解。
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【单选题】What does the underlined word 'stifling' (Paragraph 1) probably mean?
A.
Disappearing gradually.
B.
Giving out into the air.
C.
Hot and breathless.
D.
Pleasing and comfortable.
【单选题】The author is of the opinion that those who worry about losing employees after they graduate are______.
A.
uninformed of the fact that they rarely do
B.
failing to consider the possible benefits even if it does happen
C.
not considering the ways that this can be prevented
D.
worrying over nothing
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A.
with; seeing; off
B.
without; seeing; off
C.
without; see; /
D.
with; see; out
【单选题】听力原文：M: Thanks for seeing me off. W: My pleasure. Q: What will the man do? (22)
A.
He will go to school.
B.
He will leave here.
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He will go to work.
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A.
团队中的重点成员
B.
团队成员来源地区
C.
团队特点与特殊要求
D.
团队成员构成情况
E.
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【单选题】Whether to find a job or continue to study seems to be a(n) _____ topic of conversations among graduates. [ ]
A.
informal
B.
staple
C.
personal
D.
generous
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