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【简答题】
定义在R上的函数y=f（x）满足条件：f（x）不是常值函数，且f（2-x）=f（x）与f（x-1）=f（x+1）对任意x∈R成立，给出下列四个命题： ①f（x）为周期函数； ②f（x）的图象关于直线x=1对称； ③f（x）的图象关于y轴对称； ④f（x）的图象关于原点成中心对称． 其中所有正确命题的序号是______．
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举一反三
【简答题】进出口食品标签审核适用于对进出口（ ）食品标签审核、检验管理。 A内包装 B 预包装 C 外包装 D 固定包装
【单选题】(仅选择本题号对应横线处的正确答案)Read aloud paragraphs 16 and 17 until you have learned them by heart. Then try to complete the passage from memory:In _____1_____, Maxwell was right. Light is a wave. But Einstein wa...
A.
duality
B.
retrospect
C.
intuitive
D.
inspiration
E.
caution
F.
baffled
【简答题】"This light is too ________ for me to
read by. Don ’ t we have a brighter bulb some where ” ; said the elderly man.A. A) mild B. B) dim C. C) minute D. D) slight
【单选题】(仅选择本题号对应横线处的正确答案)Read aloud paragraphs 16 and 17 until you have learned them by heart. Then try to complete the passage from memory:In _____1_____, Maxwell was right. Light is a wave. But Einstein wa...
A.
duality
B.
retrospect
C.
intuitive
D.
inspiration
E.
caution
F.
baffled
【单选题】"This light is too___ for me to read by. Don't we have a brighter bulb somewhere" ; said the elderly man.
A.
mild
B.
dim
C.
minute
D.
slight
【单选题】(仅选择本题号对应横线处的正确答案)Read aloud paragraphs 16 and 17 until you have learned them by heart. Then try to complete the passage from memory:In _____1_____, Maxwell was right. Light is a wave. But Einstein wa...
A.
duality
B.
retrospect
C.
intuitive
D.
inspiration
E.
caution
F.
baffled
【单选题】(仅选择本题号对应横线处的正确答案)Read aloud paragraphs 16 and 17 until you have learned them by heart. Then try to complete the passage from memory:In _____1_____, Maxwell was right. Light is a wave. But Einstein wa...
A.
duality
B.
retrospect
C.
intuitive
D.
inspiration
E.
caution
F.
baffled
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