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【简答题】
投针的R程序如下:buffon<-function(n, l=0.8, a=1){ k<-0 theta<-runif(n,0, pi); x<-runif(n,0, a/2) for (i in 1:n){ if (x[i]<= l/2*sin(theta[i])) k<-k+1 } ( )}buffon(100000,l=0.8,a=1)
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【单选题】When man began to search the skies, he saw a lot of things. In the universe(宇宙), the earth seemed to be just a small bit of dust. It is only a small planet, and travels around the sun. The sun togethe...
A.
the Milky Way is the only galaxy
B.
other galaxies are near ours
C.
the sun is a large star in the Milky Way
D.
the earth is a small part of the universe
【单选题】关于收集资料，下列哪项是错误的( )
A.
收集资料要准确、全面
B.
收集资料是在患者刚入院时进行
C.
收集资料贯穿护理工作全过程
D.
收集资料是护理评估的第一步
E.
收集资料为作出护理诊断提供依据
【简答题】机油在活塞环和汽缸壁之间形成密封油膜。
【单选题】Our whole physical universe, when______to the simplest terms, is made up of two things, energy and matter.
A.
being reduced
B.
reducing
C.
reduced
D.
to be reduced
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