隧洞和涵管充水时应迅速进行，以免洞内产生负压、水锤等现象而引起破坏。
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Brand neutral packaging refers to the packaging().
A. without country name of production, place name, factory name and trademark
B. without country name of manufacture, but name of foreign manufacturer
C. without country name of production, but there is a trademark designated by the buyer
D. without anyinformation
The shipping mark is the () in the shipping.
A. main signs
B. destination sign
C. origin mark
D. mark of package number
Pop can packaging belongs to().
A. stackable packaging
B. portable packaging
C. matching packaging
D. easy to open package
Packaging is usually divided into().
A. transport packaging
B. sales packaging
C. disposable packaging
D. repeated packaging
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