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【简答题】
在测量或计量中取有效数字的位数的准则是：对不需要标明误差的数据，其有效位数应取到最末一位数字为可疑数字；对需要标明误差的数据，其有效位数应取到与误差同一数量级。( )
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举一反三
【简答题】A．She is not permitted to live off-campus this year. B．She has been living off-campus for a year. C．She is happy with her living arrangements. D．She is required to move next year.
【简答题】蛋白质中N的含量为（），平均含氮量（）。
【单选题】Moving off campus won’t always _____.
A.
do you harm
B.
do you good
C.
does you good
D.
did you good
【简答题】A．She is not permitted to live off-campus this year. B．She has been living off-campus for a year. C．She is happy with her living arrangement. D．She is required to move next year.
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