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【单选题】
半波对称振子天线臂越粗,相应该天线的平均特性阻抗会( ),波长缩短系数会( )。
A.
越小 , 越大
B.
越小 , 越小
C.
越大 , 越大
D.
越大 , 越小
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【单选题】护照持有人 16 周岁以上的,护照有效期为( )年。
A.
1 年
B.
3 年
C.
5 年
D.
10 年
【单选题】The New England Centenarian Study at Boston University finds that______.
A.
centenarians are more likely to get depressed
B.
most people over 100 have a happy family life
C.
old people are not interested in social activities
D.
many centenarians enjoy being with other people
【单选题】( )商店组织有关人员抽取适当的消费者样本进行调查,向其了解对促销活动的感受或评价促销效果
A.
费者调查法
B.
促销前后对比法
C.
目标评估法
D.
问卷调查法
【单选题】According to Para. 2, a new study finds that______.
A.
learning a new language can benefit a lot when you grow old
B.
you have to learn a new language at a very young age
C.
picking up a new language have few benefits later in life
D.
picking up a new language can cause serious health problems
【单选题】A new study in Journal of Personality and Social Psychology finds that .
A.
optimistic people live longer
B.
optimism is rarely found in the elderly
C.
people tend to be more optimistic when they live longer
D.
healthy people tend to be optimistic
【简答题】The ocean is heating up. That&39;s the conclusion of a new study that finds that Earth&39;s oceans now (27)heat at twice the rate they did 18 years ago. Around half of ocean heat intake since 1865 has...
【单选题】接触器的额定电压是指 的额定电压,应等于负载的额定电压。
A.
线圈
B.
辅助触头
C.
主触头
D.
灭弧装置
【单选题】以建筑石膏为基料的是( )
A.
纤维石膏板
B.
纸面石膏板
C.
石膏装饰板
D.
膨胀珍珠岩装饰石膏板
【简答题】Passage 1 A new study finds that even mild stress can affect your ability to control your emotions. A team of neuroscientists at New York University say that their findings suggest that certain _1_ th...
【单选题】未来主义左翼作家,移居法国的意大利人“卡努杜” 于战前______年发表的《第七艺术宣言》,理论直接影响了一战后法国先锋派电影。
A.
1919年
B.
1911年
C.
1923年
D.
1928年
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