self.conn.close()
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。爱思助手下载最新版本对此有专业解读
第四十八条 承运人在船舶开航前和开航当时，应当谨慎处理，使船舶处于适航状态，妥善配备船员、装备船舶和配备供应品，并使货舱、船舶其他载货处所以及承运人提供的载货集装箱适于并能安全收受、载运和保管货物。
The instances/ directory is for DIMACS-format benchmarks.
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