2. Which of the following characteristics describes an all-or-nothing vaccine?
A. Take = 80%, degree = 50%
B. Take = 100%, degree = 99%
C. Take = 80%, degree = 100%
D. Take = 100%, degree = 70%
vaccine question 2 ?
2021-02-03 7:30 pm
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收錄日期: 2021-04-24 08:27:55
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