使用____可以为整个Internet范围内的每个文档给定一个唯一识别的标识。
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编写程序，输入单价、数量和金额，按照500元以上打8折的原则，计算总价与找回零钱数。
The exfoliative toxins, TSST-1, and the enterotoxins are all superantigens. The genes for these toxins are
A. Present in all strains of Staphylococcus aureus
B. Widely distributed on the staphylococcal chromosome
C. On both the staphylococcal chromosome (TSST-1 and exfoliative toxins) and on plasmids (enterotoxins)
D. On the staphylococcal chromosome in a pathogenicity island
E. On plasmids
Which of the following statements regarding the role of protein A in the pathogenesis of infections caused by Staphylococcus aureus is correct?
A. It is responsible for the rash in toxic shock syndrome
B. It converts hydrogen peroxide into water and oxygen
C. It is a potent enterotoxin
D. It is directly responsible for lysis of neutrophils
E. It is a bacterial surface protein that binds to the Fc portion of IgG1
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