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二极管是利用其( )特性来实现开关作用。
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【简答题】CAs are ____1____( 付费 ) to ____2_____ ( 做广告 ) a product or a service ; PSAs are often run __3____ ( 免费 ) and are meant to ___4____ ( 教育 ) people.
【简答题】 以下点属于立体表面的是()。 A.B.C.D. D
【简答题】PSAs are often run___1___ (免费), and are intended to educate people about health, safety, or any other issue which affects ___2____(公共福利).
【单选题】PSAs are often run _____ free, and are ______ to educate people about health, safety, or any other problem that affects public welfare.
A.
for, mean
B.
for, meant
C.
of, to mean
D.
in, meaning
【简答题】下列表示,已经点击(访问)过的可链接文字的的颜色是黑色的是()
【简答题】Advertisements, which often use words and pictures to p____1_____ people to buy a product, or to believe in an idea, play an important p ____2____ in our lives. We can find them almost w____3___ we go...
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