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【多选题】
关于有效数字的说法,正确的是( )。
A.
对于“0”这个数字，它在数中的位置不同，可能是有效数字，也可能是多余数字。
B.
若把多余数字的“0”用10的乘幂来表示，使其与有效数字分开，这样在10的乘幂前面所有数字包括“0”皆为有效数字。
C.
作为测量结果并注明误差值的数值，其表示的数值等于或大于误差值的所有数字，包括“0”皆为有效数字。
D.
上面两种情况外的数后面的“0”则很难判断是有效数字还是多余数字，因此应避免采用这种不确切的表示方法。
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参考答案：
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