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【单选题】
2016年8月6日, 我国在西昌卫星发射中心用长征三号乙运载火箭,成功发射了( )。它是我国首颗移动通信卫星,也被誉为 “中国版的海事卫星”,其成功发射标志着我国进入到了卫星移动通信的手机时代 。A.
神舟 11号
B.
天宫一号
C.
北斗导航卫星
D.
天通一号 01星
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B.
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C.
Doubtful
D.
Friendly
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A.
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B.
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C.
Studying cultural anthropology helps develop a broad perspective.
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【单选题】关于三极管有下列说法,其中正确说法的个数是______。 1三极管可工作在放大状态或开关状态;2温度对三极管的工作参数影响较大;3三极管电流共射极直流放大系数近似为集电极电流和基极电流之比;4一般情况下三极管导通程度越高,集电极一发射极间电压越大;5三极管的基本放大电路有共射极、共集电极、共基极等三种组态
A.
2个
B.
3个
C.
4个
D.
5个
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