设α=i+2j+3k,β=i-3j-2k,与α、β都垂直的单位向量为()。
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— I mean the best way is using your own mobile phone or computer to operate it.
如图1-1所示,已知αAB=225°16′30″,测得连接角及折角(左角)为:βB=35°20′42″、βC=190°24′54″、βD=170°18′12″。试计算各边的坐标方位角αBC、αCD、αDE各为多少?
设语句x++的时间是单位时间,则以下语句的时间复杂度为()。
for(i=1;i<=n;i++)
for(j=i;j<=n;j++)
x++;
I like to think ______. I am always the one finding new ways to a situation or challenge.
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— I mean the best way is using your own mobile phone or computer to operate it.
— May I suggest the sales start on or about October 1?
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—I think we can use two or more kinds of media together in an advertising campaign.
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— I wonder whether I could accept this discount or not.
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设α=i+2j+3k,β=i-3j-2k,与α、β都垂直的单位向量为()。
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