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【判断题】
微分方程的通解包含了所有的特解。( )A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】We all went out _____ the lost boy, but after we had _____ everywhere, we didn't find him. [ ]
A.
searching for; searching
B.
searching; searched
C.
in search of; searched
D.
in search for; searching
【单选题】What type of words is the suffix “-en” generally added to?
A.
Adjectives.
B.
Nouns.
C.
Verbs.
D.
Both A and B.
【单选题】---.We didn’t find the Blacks during the lecture. --- No one had told them about _____ a lecture.
A.
there to be
B.
there being
C.
there be
D.
there was
【单选题】“ an en in un ün ”是哪一类韵母? What type of finals are they?
A.
front nosal finals
B.
back nosal finals
【单选题】What type of words is the suffix “-en” generally added to?
A.
Adjectives.
B.
Nouns.
C.
Verbs.
D.
Both “ Adjectives ” and “ Nouns ”.
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