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【判断题】
海关发票是出口商向 出 口海关报关的文件之一。A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【单选题】—You were out when I dropped in at your house. —Oh, I ________ for a friend from England at the airport.
A.
was waiting
B.
had waited
C.
am waiting
D.
has waited
【单选题】—You were out when I dropped in at your house yesterday. —Oh, I________ for a friend from Beijing at the railway station.
A.
was waiting
B.
had waited
C.
am waiting
D.
have waited
【简答题】已知某疏浚工程所包含的作业工时(天)，成本(万元)等的情况如表1所示。 问题 1．画出该工程正常情况下的网络图。 2．确定关键线路、总工期和总成本。 3．试确定把整个工程的工期减少7天，并使总成本增加最少的最佳方案。求出该方案所对应的总成本。
【单选题】—You were out when I dropped in at your house.
A.
h, I ________ for a friend from England at the airport.
B.
was waiting
C.
had waited
D.
am waiting
E.
has waited
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