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【单选题】
设lnx是f(x)的一个原函数,则f'(x)=
A.
-1/x
B.
1/x
C.
-1/x2
D.
1/x2
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A.
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B.
科学环境
C.
营销中间商
D.
顾客
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A.
“wr”
B.
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C.
“”
D.
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A.
"wr"
B.
"bw"
C.
""
D.
"br+"
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B.
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C.
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D.
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B.
"a"
C.
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D.
"w"
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A.
"br+"
B.
"tr"
C.
"wr"
D.
"bw"
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A.
"a+"
B.
"t+"
C.
"r+"
D.
"w+"
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