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6个月婴儿进行免疫接种后第二天，接种部位出现红肿，属于
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3月婴儿第一次接种的疫苗是
8月婴儿接种的疫苗是
小儿第一次口服脊灰质炎疫苗的时间为
Experts are beginning to study ways to 1. ____________ large buildings against 2. ____________attacks. They are reacting to the attacks that 3. ____________the World Trade Center buildings in New York September eleventh.The American Institute of Steel Construction has created a working group of experts to 4. ____________the reasons the buildings fell. The A-I-S-C is the organization 5.____________ fordeveloping the rules for the design of 6. ____________buildings in the United States. 7. ____________developedby the working group will help A-I-S-C decide if the design rules should be changed.The south World Trade Center building fell fifty-six minutes after a 8. ____________plane crashed into it. The north building fell about one hundred minutes after a similar 9.____________. Each building was four hundred ten meters tall. Experts say the buildings could not 10.____________the extremely hot fires caused by the airplane fuel.
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