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【单选题】
入侵探测器的探测灵敏度是指探测器对防范现场物理量变化的响应能力。对于主动红外探测器,它的度量值是( )。A.
最小温度差
B.
最小速度
C.
最大距离
D.
最小间距
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【单选题】The post-World War Ⅱ baby ______ resulted in a 43 percent increase in the number of teenagers in the 1960s and 1970s.
A.
bomb
B.
boom
C.
production
D.
prosperity
【单选题】It can be inferred from the passage that ______.
A.
advertisements are trying to help teenagers to find themselves
B.
most teenagers are actually not rebelling at all in a real sense
C.
advertisements are always misleading in carving out a teenage market
D.
most teenagers manage to become popular by dressing as they please
【简答题】听力原文：Despite efforts of the government to reduce the incidence of smoking among agers and young s, such as the new law which makes smoking more expensive, I regret to say that smoking is not ...
【单选题】The author's own discoveries from the day-to-day relationships of parents and young teenagers indicate that ______.
A.
storm and stress between the parents and the teenagers are normal
B.
storm and conflicts are unavoidable
C.
parents can never avoid the conflicts unless they love their children
D.
parents' strictness lead to their children's disapproval of them
【单选题】Her overall language proficiency remains that of a toddler.
A.
disabled
B.
baby
C.
pupil
D.
teenager
【简答题】已知逻辑函数的波形如下图所示,试写出其逻辑函数表达式。
【简答题】已知A、B为输入，F为输出，波形如下图1-8所示。根据波形图写出真值表及函数F的表达式。
【简答题】f(t)信号波形如下图所示,画出信号的导函数波形,并写出其表达式
【单选题】F inancial managers are responsible for determining: I. how suppliers will be paid. II. the appropriate level of debt for a firm. III. which projects a firm should undertake. IV. how to invest the fir...
A.
I and II only
B.
II and III only
C.
II, III and IV only
D.
I, II ， III and IV
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