出自:乐山师范学院应用统计学

There are 20 blanks in the following passage. For each blank there are four choices marked A), B), C) and D). You should choose the ONE that best fits into the passage. Then mark the corresponding letter on the answer sheet. Generally speaking, a British is widely regarded as a quiet, shy and conservative person who is 36 only among those with whom he is acquainted. When a stranger is at present, he often seems nervous, 37 embarrassed. You have to take a commuter train any morning or evening to 38 the truth of this. Serious-looking businessmen and women sit reading their newspapers or dozing in a corner; hardly anybody talks, since to do so would be considered quite offensive. 39 , there is an unwritten but clearly understood code of behavior which, 40 broken, makes the offender immediately the object of 41. It has been known as a fact that the British has a 42 for the discussion of their weather and that, if given a chance, he will talk about it 43. Some people argue that it is because the British weather seldom 44 forecast and hence becomes a source of interest and 45 to everyone. This may be so. 46 a British cannot have much 47 in the weathermen, who, after promising fine, sunny weather for the following day, are often proved wrong 48 a cloud over the Atlantic brings rainy weather to all districts! The man in the street seems to be as accurate---or as inaccurate---as the weathermen in his 49. Foreigners may be surprised at the number of references 50 weather that the British make to each other in the course of a single day. Very often conversational greetings are 51 by comments on the weather. “Nice day, isn’t it?” “Beautiful!” may well be heard instead of “Good morning, how are you?” 52 the foreigner may consider this exaggerated and comic, it is worthwhile pointing out that it could be used to his advantage. 53 he wants to start a conversation with a British but is 54 to know where to begin, he could do well to mention the state of the weather. It is a safe subject which will 55 an answer from even the most reserved of the British. 36. A. relaxed B. frustrated C. amused D. exhausted
There are 20 blanks in the following passage. For each blank there are four choices marked A), B), C) and D). You should choose the ONE that best fits into the passage. Then mark the corresponding letter on the answer sheet. Generally speaking, a British is widely regarded as a quiet, shy and conservative person who is 36 only among those with whom he is acquainted. When a stranger is at present, he often seems nervous, 37 embarrassed. You have to take a commuter train any morning or evening to 38 the truth of this. Serious-looking businessmen and women sit reading their newspapers or dozing in a corner; hardly anybody talks, since to do so would be considered quite offensive. 39 , there is an unwritten but clearly understood code of behavior which, 40 broken, makes the offender immediately the object of 41. It has been known as a fact that the British has a 42 for the discussion of their weather and that, if given a chance, he will talk about it 43. Some people argue that it is because the British weather seldom 44 forecast and hence becomes a source of interest and 45 to everyone. This may be so. 46 a British cannot have much 47 in the weathermen, who, after promising fine, sunny weather for the following day, are often proved wrong 48 a cloud over the Atlantic brings rainy weather to all districts! The man in the street seems to be as accurate---or as inaccurate---as the weathermen in his 49. Foreigners may be surprised at the number of references 50 weather that the British make to each other in the course of a single day. Very often conversational greetings are 51 by comments on the weather. “Nice day, isn’t it?” “Beautiful!” may well be heard instead of “Good morning, how are you?” 52 the foreigner may consider this exaggerated and comic, it is worthwhile pointing out that it could be used to his advantage. 53 he wants to start a conversation with a British but is 54 to know where to begin, he could do well to mention the state of the weather. It is a safe subject which will 55 an answer from even the most reserved of the British.
设 阶方阵 具有 个不同的特征值是 与对角阵相似的( ) A. 充分必要条件; B. 充分而非必要条件; C. 必要而非充分条件; D. 即非充分也非必要条件。
设f(x)为3次实系数多项式,则 A. f(x)至少有一个有理根 B. f(x)至少有一个实根 C. f(x)存在一对非实共轭复根 D. f(x)有三个实根.
若 |a a a b b b c c c|=m,则 ( ). A. 30m B. -15m C. 6m D. -6m
是n维复空间V的两个子空间,且 ,则dimW1=r1,dimW=r2,则W1+W2的维数为( ) A.=r1+r2 B.>r1+r2 C.max<=dim<=min
设A,B为任意两个n级方阵,则如下等式成立的是 A.(A+B)2=A2+2AB+B2 B.|A+B|=|A|+|B| C.|AB|=|B||A| D.|A-B|=|A||B|
设 n阶矩阵A的行列式 , 是 的伴随矩阵,则( ) A. (A)=|A|N-1A; B.(A)= |A|N+1A; C.(A)= |A|N-2A ; D. (A)= |A|N+2A。
一个n(>=2)级方阵A经过若干次初等变换之后变为B, 则一定有 A.|A|=|B| B. Ax=0与Bx=0 同解 C. 秩(A)= 秩(B) D.A=B
设向量组∂1,∂2线性无关,则向量组 线性无关的充分必要条件为 A.ad不等于bc B.ad=bc C.ab不等于cd D.ab=cd
对于n元方程组,下列命题正确的是( ). A. 如果 只有零解,则 也只有零解 B. 如果 有非零解,则 有无穷多解 C. 如果 有两个不同的解,则 有无穷多解 D. 有唯一解的充分条件是
设向量组线性无关, 线性相关,则( ). A. 一定能由 线性表示 B. 一定能由 线性表示 C. 一定不能由 线性表示 D. 一定不能由 线性表示
∂是线性空间V上的线性变换, ,那么 ∂关于V的基 的矩阵 是 ( ) A.200-110011 B.2-10011100 C.21011100-1 D2-10111000
如果把 代入实二次型 都有 ,那么f是 ( ) A. 正定 B. 负定 C. 未必正定
若矩阵A的不变因子为 , 则A的全部初等 因子为 ( ) A.(x-1)2 B.(x-1) C(
∂为欧氏空间V上的对称变换,下面正确的是 ( ) A.∂() B. C.
设矩阵 和 分别是 和 的矩阵,秩(A)=2,秩(B)=3 ,则秩(AB) 是 A. 12 B. 2 C. 3 D. 4
下列运算中正确的是( ) A. (AB)r=arbr; B. (AB)-1=A-1B-1; C.(A+B)-1=B-1+A-1 ; D.(AB)-1=B-1A-1 。
设ɑ=(0,1,-1),β=(1,0,-2),则向量组ɑ,β的秩=(____).
在P[X]中,向量1+x+x2 关于基1,x-1,x2-3x+2 的坐标为 ((____))。
标准正交基下的度量矩阵为______(____)_______。
一个n 阶矩阵是非退化的充分必要条件是它的秩=(____).
设A为n级实对称矩阵,则A正定的充要条件是A的特征多项式的根((____))
设n 阶矩阵 A的元素全为1,则 A的 n个特征值是 (____) 。
设3阶矩阵A 的伴随矩阵为 ,∣ ∣=1,则∣-2 ∣= (____).
f(x)=x4+x3-1 ,则 =(____)
已知∣A∣=1012 -1103 ,则 12- 22+ 32- 42=(____).
若f(x)+g(x)=1 ,则(f(x),g(x))= (____) .
正交变换在标准正交基下的矩阵为______(____)_______。
若A= (123)•(4,5,6),则∣ A∣=(____).
设A为3级矩阵, 且|A|=1/2 , 则|A-1-A*| = (____)
以下哪列代码是将直方图转化为玫瑰图的关键( ) A.theme B.coord C.ticks D.panel A. A B. B C. C D. D
水泥厂用自动包装机包装水泥,每袋额定重量是50kg ,某日开工后随机抽查了9 袋,称得重量如下: 49.6,49.3,50.1,50.0,49.2,49.9,49.8,51.0,50.2设每袋重量服从正态分布,问包装机工作是否正常(α =0.05 )?
3/水泥厂用自动包装机包装水泥,每袋额定重量是50kg ,某日开工后随机抽查了9 袋,称得重量如下: 49.6,49.3,50.1,50.0,49.2,49.9,49.8,51.0,50.2设每袋重量服从正态分布,问包装机工作是否正常(α =0.05 )?
若直线l1:y=2x+3,直线l2与l1关于直线y=-x对称,则直线l2的斜率为 A.1/2 B.-1/2 C.2 D.-2
直线x-y+1=0与圆(x+1)2+y2=1的位置关系是 A. 相切 B. 直线过圆心 C. 直线不过圆心但与圆相交 D. 相离
过点(1,0)且与直线x-2y-2=0平行的直线方程是() A.x-2y-1=0 B.x-2y+1=0 C.2x+y-2=0 D.x+2y-1=0
经过点P(2,-3)作圆(x+y)2+y2=25的弦AB,使点P为弦AB的中点,则弦AB所在直线方程为() A. <Object: word/embeddings/oleObject2.bin> B. <Object: word/embeddings/oleObject3.bin> C. <Object: word/embeddings/oleObject4.bin> D. <Object: word/embeddings/oleObject5.bin>
若直线l1:y=k(x-4)与直线l2关于点(2,1)对称,则直线l2 恒过定点() A.(0,4) B.(0,2) C.(-2,4) D.(4,-2)
在等腰三角形AOB中,AO=AB,点O(0,0),A(1,3),点B在x轴的正半轴上,则直线AB的方程为( ) A. y-1=3(x-3) B. y-1=-3(x-3) C. y-3=3(x-1) D. y-3=-3(x-1)
直线y=kx+3与圆(x-3)2+(y-2)2=4相交于M,N两点,若|MN|>=2√3,则k的取值范围是() A.[-3/4,0] B.[-∞,-3/4]∪[0,+∞] C.[-√3/3,√3/3] D.[-2/3,0]
在平面直角坐标系x0x中,已知圆x2+y2=4上有且仅有四个点到直线12x-5y+c=0的距离为1,则实数c的取值范围是
已知点A(1,-1),点B(3,5),点P是直线y=x上动点,当|PA|+|PB|的值最小时,点P的坐标是
曲线y=x2与x=y2轴围成的图形的面积为(____)。
设z=f(u,v),其中u=xy,v=x-y,则∂z/∂y (____)
∫1/√1-x2dx=()
曲线y=1-x2与x轴围成的图形的面积为(____)。
设f(x)的一个原函数为lnx ,则∫xf.(x)dx= (____)。
若级数 是 更序级数,则( ) A. 和 同敛散 B. 可以发散到+∞ C. 若 绝对收敛, 也收敛 D. 若 条件收敛, 也条件收敛
已知F.(x)=f(x), 则∫f(x)dx= ( ); A.F(X)+sinC B.F(X)+e C.F(X)+C2 D.F(X)+lnC