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【单选题】
LED 数码若采用动态显示方式,下列说法错误的是( ) 。
A.
将各位数码管的段选线并联
B.
将段选线用一个 8 位 I/O 端口控制
C.
将各位数码管的公共端直接连接在 +5V 或者 GND 上
D.
将各位数码管的位选线用各自独立的 I/O 端口控制
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【单选题】Three students from Changjiang college _____ while saving the ______ boys.
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【单选题】Why do American boys do better in math while girls usually excel in reading skills?
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Boys are interested in math while girls usually like reading.
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Boys get more  training in math and girls get more training in reading.
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Boys are presupposed to be good at math and girls at reading.
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【单选题】下列属于大气自净作用的是
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降落到地面又被风吹起再次进入大气
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转变成二次污染物
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污染物上升至平流层
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相关题目：
【多选题】圆明园与其毗连之( ),称为“三园”。
A.
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B.
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C.
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【单选题】Two of the boys ________ while playing football.
A.
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Boys are interested in math while girls usually like reading.
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查看完整题目与答案
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A.
被植物吸收
B.
污染物下风侧浓度增加
C.
降落到地面又被风吹起再次进入大气
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污染物上升至平流层
查看完整题目与答案
【单选题】Three students from Changjiang college _____ while saving the ______ boys.
A.
got drown; drowning
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got drowned; drowning
C.
were drowned; drowned
D.
were drowning; drowning
查看完整题目与答案
【单选题】Why do American boys do better in math while girls usually excel in reading skills?
A.
Boys are interested in math while girls usually like reading.
B.
Boys have a  math gene and girls have inborn reading skills.
C.
Boys get more  training in math and girls get more training in reading.
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Boys are presupposed to be good at math and girls at reading.
查看完整题目与答案
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被植物吸收
B.
污染物进入大气环流
C.
降落到地面又被风吹起再次进入大气
D.
转变成二次污染物
E.
污染物上升至平流层
查看完整题目与答案