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Where a container，pallet or similar article of transport is used to consolidate goods，the number of packages or units enumerated in the bill of lading as packed in such article of transport（）to be the number of packages or units in calculating the amount beyond which the carrier or the ship is not reliable.

A. is deemed
B. are deemed
C. deems
D. deem

两瓶法对水中溶解氧的测定，是根据氧气具有氧化性而采用氧化还原滴定法。（）

A. 正确
B. 错误

试述传染病的基本特征。

两个平行放置的载流导体，当通过的电流为同方向时，两导体将呈现出什么现象？