皮皮学，免费搜题
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【判断题】
函数 在定义域内有拐点 .A.
正确
B.
错误
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】The teacher told his student to make the most of the opportunities ___hand.
A.
in
B.
of
C.
at
D.
on
【单选题】The teacher told his students that the earth _____ round the sun. [ ]
A.
go
B.
went
C.
goes
D.
had gone
【单选题】The teacher told his students to make the most of the opportunities ( ) hand.
A.
on
B.
at
C.
to
D.
by
【单选题】The teacher told his class that the light ___ faster than the sound.
A.
travel
B.
traveled
C.
travels
【单选题】The teacher told his students that the earth___________round like a ball.
A.
be
B.
is
C.
had been
D.
Was
【单选题】1,3-戊二烯经臭氧化,在锌存在下水解,可得到哪一种产物?
A.
HCHO + OHCCHO+CH3CHO
B.
HCHO + HOOCCH2COOH
C.
HCHO + CH3COCHO
D.
CH3COCHO + CO2 + H2O
【简答题】用于衡量柱效的参数
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