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【单选题】
已给下图所示的二叉树，A，B，C，D的分别为7，5，2，4，则该树的带权路径长度为( )A．46 B．36 C．35 D．都不是【图片】A.
A
B.
B
C.
C
D.
D
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举一反三
【单选题】杆件的受力和截面如图,下列说法中,正确的是
A.
σ 1 >σ 2 >σ 3 ;
B.
σ 2 >σ 3 >σ 1
C.
σ 3 >σ 1 >σ 2
D.
σ 2 >σ 1 >σ 3
【单选题】Reading is not the only way to gain knowledge of the work in the past. There is another large. reservoir which may be called experience, and the college students will find, that every craftsman (工匠) h...
A.
personal experience
B.
wild weeds among good plants
C.
the information from the parents
D.
the vast store of traditional practices
【单选题】Reading is not the only way to gain knowledge of the work in the past. There is another large reservoir (知识库) which may be called experience, and the college student will find that every craftsman (工匠...
A.
personal experience
B.
wild weeds among good plants
C.
the information from the parents
D.
the vast store of traditional practices
【单选题】Reading is not the only way to gain knowledge of the work in the past. There is another large reservoir (知识库) which may be called experience, and the college student will find that every craftsman (工匠...
A.
personal experience
B.
wild weeds among good plants
C.
the information from the parents
D.
the vast store of traditional practices
【简答题】沈阳市某高中有高一学生600人，高二学生500人，高三学生550人，现对学生关于消防安全知识了解情况进行分层抽样调查，若抽取了一个容量为n的样本，其中高三学生有11人，则n的值等于（ ）。
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