单项选择题
If 5x + 13 = 31, what is the value of
?()
A.A
B.B
C.C
D.D
E.E
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单项选择题
In writing all of the integers from 1 to 300, how many times is the digit 1 used()
A、60
B、120
C、150
D、160
E、180
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单项选择题
In the figure below, if the radius of circle O is 10, what is the length of diagonal AC of rectangle OABC()
A.A
B.B
C.C
D.D
E.E
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