已知方程3x2+px+5=0的两个根x1，x2满足，则p=( )．
A. 10
B. -6
C. 6
D. -10
E. 12
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区别棉花产品与羊毛产品，最简便的方法是( )。
A. 加稀盐酸
B. 在火中灼烧
C. 加入AgNO3溶液
D. 加入碘水
设A1，A2，A3为三个独立事件，且P(Ak)=p(k=1，2，3；0＜p＜1)，则这三个事件不全发生的概率是( )．
A. (1-p)3
B. 3(1-p)
C. (1-p)3+3p(1-p)
D. 3p(1-p)2+3p2(1-p)
E. 3p(1-p)2
预备犯的处罚原则是( )。
A. 可以从轻、减轻处罚
B. 应当减轻、免除处罚
C. 可以从轻、减轻或者免除处罚
D. 应当从轻、减轻或者免除处罚
Which of the following is LEAST likely to be the author's attitude toward prison
A. Detention center is preferred to prison in correcting all the criminals.
B. Harsh penalty and prison may not be in the best interest of the society
C. It is better to educate and reform the criminals than to lock them up.
D. The function and effectiveness of prisons in Britain have not improved much over the last decade.
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