什么是P/O比？
顶棚吊顶用的木龙骨和角钢的损耗率为（）。 3%。 5%。 6%。 7%。
Owner shall have a lien on the cargo for freight，dead-freight，demurrage and damages for detention．It means that（）. Owner will not deliver the cargo if freight not paid。 Owner will keep the dead-freight until the cargo has been delivered。 Owner will keep the demurrage as soon as the cargo be delivered。 Owner shall have no right of detention for the damaged cargo to be delivered。
什么是抗氰呼吸？
敬酒的顺序是什么？
数字信号的基带传输中对信道传输码的基本要求是（）
