Vaccines can guarantee complete protection from a disease.

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• Which one of the following is not an aspect of PepsiCo’s water protection and conservation policy?
• The project of railway switch snow protection system based on the principle of the air umbrella, was the second prize winner of
• Protection methods against the metal corrosion include（）
• Vaccines do not guarantee complete protection from a disease because sometimes the host’s（）system simply does not respond adequa
• （）(give) proper protection, land may not be ruined.