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培养驯化污泥前期的闷曝时间为15~20天()

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温湿度自动监测系统应当与企业计算机终端进行数据对接,自动在计算机终端中存储数据,可以通过计算机终端进行实时数据查询和历史数据查询()

首营品种是什么意思?

Under a time charter party , the charterer pays for().

A. capital cost
B. fuel
C. ling costs
D. wages of crew

The Air Waybill serves as().

A. a document of title to the s
B. a contract for transporion
C. a receipt and delivery of shipment
D. a convention for air transport

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