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问题
单项选择题
准确度等级是按照满度（）来划分的。
A、实际误差
B、相对误差
C、绝对误差
D、准确误差
答案
参考答案：B
选择题
词语释义.( )
The girl couldn't dance
when she was five
.
A. at the age of five
B. five years old
C. when she was young
D. five years ago
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解答题
解分式方程：
3
x+1
=
1
x-1
．
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