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【单选题】
A human quality apparently not essential in someone who works with concrete is ______.A.
carefulness
B.
patience
C.
self-control
D.
inventiveness
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举一反三
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【单选题】已知定义域为D的函数f（x），若对任意x∈R，存在正数M，都有|f（x）|≤M成立，则称函数f（x）是定义域D上的“有界函数”，已知下列函数：①f（x）=sinx·cosx+1；② ；③f（x）=1-2 x ；④ ，其中“有界函数”的个数是 [ ]
A.
1
B.
2
C.
3
D.
4
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