试证明：在T-s图上，如图4-11所示的理想气体的任意两条定压过程曲线（或定容过程曲线）[tex=2.429x1.286]g67xYVqAwbEpgWn1PrQc2A==[/tex]及[tex=2.429x1.286]FEJZpHvFzwD5tj1B7FSwxg==[/tex]的纵坐标之比保持不变，即[tex=4.0x2.143]W1+OybZPpxDmxrHv2X/52jeNF27wKgvLwMjWaOq4X2EYt24csI4MmmIwlZaVJFSSD9muYpSnJXxyn1ohmET9xQ==[/tex][img=223x251]17d9af1dc11d9e8.png[/img]
举一反三
- 试证明：在T-s图上，如图4-9所示的理想气体的任意两条定压过程曲线（或定容过程曲线）[tex=2.429x1.286]DKKjLvwzObaZ5IHNXPBSAU51hk/mUdQK9DfD9kiI054=[/tex]及[tex=2.429x1.286]0jlBPR2jPrx+YA62dYDYNh6yyhUxT2AnxXvwBPJUwnI=[/tex]两者间的水平距离处处相等，即[tex=6.357x1.286]jj1LErem0cGQepMSb+jZbugpwg74cRrhYCVCySK0Y97bRteFYPK/wsmR0CV7tC+hf4rQfwhKl6SBGJ9npPtG7Q==[/tex][img=192x156]17d9aecf20ef128.png[/img]
- 以4，9，1为为插值节点，求\(\sqrt x \)的lagrange的插值多项式 A: \( {2 \over {15}}(x - 9)(x - 1) + {3 \over {40}}(x - 4)(x - 1) + {1 \over {24}}(x - 4)(x - 9)\) B: \( - {2 \over {15}}(x - 9)(x - 1) + {3 \over {40}}(x - 4)(x - 1) + {1 \over {24}}(x - 4)(x - 9)\) C: \( - {2 \over {15}}(x - 9)(x - 1) + {3 \over {40}}(x - 4)(x +1) + {1 \over {24}}(x - 4)(x - 9)\) D: \( - {2 \over {15}}(x - 9)(x - 1) + {3 \over {40}}(x - 4)(x - 1) - {1 \over {24}}(x - 4)(x - 9)\)
- 同时掷2颗均匀骰子，X表示点数大于4出现的个数，则以下结果正确的是 A: X服从二项分布 B: P(X=0)=P(X=1) C: P(X=1)=4/9 D: P(X=0)=1/9 E: P(X=2)=4/9 F: P(X>;0)=1 G: P(X<;2)=5/9 H: P(X>;1)>;0.5
- 若要将一个长度为N=16的序列x(n)重新位倒序,作为某一FFT算法的输入,则位倒序后序列的样本序号为( )。 A: x(15), x(14), x(13), x(12), x(11), x(10), x(9), x(8), x(7), x(6),<br/>x(5), x(4), x(3), x(2), x(1), x(0) B: x(0), x(4), x(2), x(6), x(1), x(5), x(3), x(7), x(8), x(12), x(10),<br/>x(14), x(9), x(13), x(11), x(15) C: x(0), x(2), x(4), x(6), x(8), x(10), x(12), x(14), x(1), x(3), x(5),<br/>x(7), x(9), x(11), x(13), x(15) D: x(0), x(8), x(4), x(12), x(2), x(10), x(6), x(14), x(1), x(9), x(5),<br/>x(13), x(3), x(11), x(7), x(15)
- 掷一枚均匀骰子，直到出现的点数小于3为止，记抛掷的次数为X，则以下结果正确的是 A: P(X=2)=2/9 B: P(X≥3)=4/9 C: P(X≤3)=19/27 D: P(X=1)=2/3 E: P(X≤2)=3/4 F: P(X＝1)＝1/2 G: P(X=2)=1/4 H: P(X<3)=7/8