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【简答题】
大型广告牌靠两根下端固定的立柱支承，尺寸如图。广告牌的重量为980N/m2，承受的最大风压为600Pa。立柱为α=0.8的空心圆柱，许用应力[σ]=160MPa。不计立柱和固定装置重量，试选择立柱外径。
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【单选题】Media Selection for Advertisements After determining the target audience for a product or service, advertising agencies must select the appropriate media for the advertisement. We discuss here the ...
A.
such ads have been made much more attractive
B.
billboards can be replaced within two hours
C.
consumers travel more now than ever before
D.
the pace of urban life is much faster nowadays
【单选题】Media Selection for Advertisements After determining the target audience for a product or service, advertising agencies must select the appropriate media for the advertisement．We discuss here the majo...
A.
it has large audiences
B.
it appeals to housewives
C.
it helps build up a company's reputation
D.
it is affordable to most advertisers
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【单选题】Media Selection for Advertisements After determining the target audience for a product or service, advertising agencies must select the appropriate media for the advertisement. We discuss here the ...
A.
such ads have been made much more attractive
B.
billboards can be replaced within two hours
C.
consumers travel more now than ever before
D.
the pace of urban life is much faster nowadays
【单选题】Media Selection for Advertisements After determining the target audience for a product or service, advertising agencies must select the appropriate media for the advertisement．We discuss here the majo...
A.
it has large audiences
B.
it appeals to housewives
C.
it helps build up a company's reputation
D.
it is affordable to most advertisers
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