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protection
1.
Which one of the following is not an aspect of PepsiCo’s water protection and conservation policy?
2.
The project of railway switch snow protection system based on the principle of the air umbrella, was the second prize winner of
3.
Protection methods against the metal corrosion include（）
4.
Vaccines can guarantee complete protection from a disease.
5.
Vaccines do not guarantee complete protection from a disease because sometimes the host’s（）system simply does not respond adequa
6.
（）(give) proper protection, land may not be ruined.
7.
Cathodic protection involves supplying electrons to the metal to be protected from an external source. The external source maybe
8.
Some general corrosion protection techniques include material selection,（）,（）, and（）