1、
How many three-digit positive integers have their sum of digits divisible by 3?
有多少个三位正整数的数字之和可被3整除?
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2、
In the Concerning the Property of the Sum of Every Digit of the Back Concatenated Odd Sequences
关于反关联奇序列的各位数字之和的性质
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3、
考虑物价上涨等因素，对月数总和法进行改进，提出一种新的固定资产折旧方法。
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