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单选,5分] 在等精度观测的条件下,正方形一条边a的观测中误差为m,则正方形的周长(S=4a) 中的误差为( )

多选题
2021-09-03 16:17
A、m
B、2m
C、4m
D、以上都不对
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正确答案
C@#@C

试题解析

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