含Tween20的磷酸缓冲液（）
A. 包被液
B. 稀释液
C. 洗涤液
D. 底物溶液
E. 终止液
SIRS是指：（）。
A. 休克指数
B. 肺毛纫血管楔压
C. 全身炎症反应综合征
D. 中心静脉压
E. 呼吸窘迫综合征
传播SARS（）传播流脑（）
A. 空气
B. 水、食物
C. 蚊虫
D. 土壤
E. 母婴
Which four are true？（）
A. Has-a relationships should never be encapsulated.
B. Has-a relationships should be implemented using inheritance.
C. Has-a relationships can be implemented using instance variables.
D. Is-a relationships can be implemented using the extends keyword.
E. Is-a relationships can be implemented using the implements keyword.
F. An array or a collection can be used to implement a one-to-many has-a relationship.
G. The relationship between Movie and Actress is an example of an is-a relationship.
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