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2.超过500总吨的船舶，500总吨以下部分适用本项第1目的规定，500总吨以上的部分，应当增加下列数额：，更多细节参见爱思助手下载最新版本
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This lets us skip NULL fields entirely while still supporting fast access. For wide SQL tables with many optional columns, this can reduce the row size dramatically.
Фото: Oleksandr Ratushniak / Reuters，更多细节参见safew官方版本下载