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设一箱子中有6个红球4个白球,不放回地取两球,已知第1次取到白球,求第2次取到红球的概率为( )。
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袋内有1只黑球和1只白球,从中任取1只,若取出白球,则试验中止;若取出黑球,则把取出的球放回的同时,再加入1只黑球,然后再从中任取一球,如此下去,直到取得白球为止,试求直到第5次,均取到黑球的概率为( )。
(请在答案处填写大写字母，不要写单词）To get a sense of how women have progressed in science, take a quick tour of the physics department at the University of California, Berkeley.This is a storied place, the （26） of some of the most important discoveries in modern science—starting with Ernest Lawrence’s invention of the cyclotron (回旋加速器) in 1931. A generation ago, female faces were（27）and, even today, visitors walking through the first floor of LeConte Hall will see a full corridor of exhibits (28) the many distinguished physicists who made history here, (29) all of them white males.But climb up to the third floor and you’ll see a (30) display.There, among the photos of current faculty members and students, are portraits of the (31) head of the department, Marjorie Shapiro, and four other women whose research (32) everything from the mechanics of the universe to the smallest particles of matter. A sixth woman was hired just two weeks ago. Although they’re still only about 10 percent of the physics faculty, women are clearly a presence here.And the real (33) may be in the smaller photos to the right：graduate and undergraduate students, about 20 percent of them female. Every year Berkeley sends its fresh female physics PhDs to the country’s top universities. That makes Shapiro optimistic, but also (34). “I believe things are getting better,” she says, “but they’re not getting better as (35) as I would like.”
背景图像平铺属性中，下面（）项代表的是沿水平方向平铺？
以下不属于眼的折光物质的是
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