The word "avert" in the passage is closest in meaning to
A. place down.
B. turn away.
C. hide out.
D. move back.
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设函数f(x)在x＝0处连续，则下列命题错误的是()．
The word "rigorous" in the passage is closest in meaning to
A. disorderly.
B. strict.
C. traditional.
D. irrational.
设随机变量X，Y独立同分布，且X的分布函数F(X)，则Z＝max｛X，Y｝的分布函数为()．
A. F2(X)
B. F(x)F(y)
C. 1－[1－F(x)]2
D. [1－F(x)][1－F(y)]
设A是m×n阶矩阵，下列命题正确的是()．
A. 若方程组AX=0只有零解，则方程组AX＝b有唯一解
B. 若方程组AX=0有非零解，则方程组AX＝b有无穷多个解
C. 若方程组AX＝b无解，则方程组Ax＝0一定有非零解
D. 若方程组AX＝b有无穷多个解，则方程组AX＝0一定有非零解
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