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【单选题】
细菌内毒素的特点下列错误的是A.
主要由革兰阴性菌产生
B.
化学成分主要是脂多糖
C.
对人体组织有选择性毒性作用
D.
可单独激活补体旁路途径
E.
可使鲎血液变形细胞溶解物凝固
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【简答题】分析图F.4的输入输出关系。
【单选题】These young people are now making an active ______ to beautify our city.
A.
part
B.
effort
C.
decision
D.
plan
【单选题】Life insurance, before available only to young, healthy persons, can now be obtained for quite a large proportion of the elderly population, and, sorry, even for pet animals.
A.
before young, healthy persons available only,
B.
available only to young, healthy persons before,
C.
available only to persons young, but more healthy,
D.
before young and healthy persons only available to,
【单选题】Life insurance, before available only to young, healthy persons, can now be obtained from old people, and even for pets.
A.
before young, healthy persons available only,
B.
available only to young, healthy persons before,
C.
available only to persons young, but more healthy,
D.
before young and healthy persons only available to,
【简答题】图8．2．3所示的为某时序电路的框图和输入X与输出F1～F4关系的波形图，试设计该电路。
【简答题】一位全加器FA和2—4译码器及与非门组成的逻辑电路如图3.2.85所示，分析出该电路的输出与输入的关系。要求写出函数F(A，B，C，D)的逻辑表达式(不用化简)，最终结果表示为最大项之积的形式。
【单选题】Only now are young people ____the importances of having knowledge.
A.
aware of
B.
be aware of
C.
aware
D.
have become aware of
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