【单选题】据统计,某地区一年中下雨(记作事件 A )的概率是 ,刮风(三级以上的风)(记作事件 B )的概率是 ,既刮风又下雨的概率是 .则下列各式正确的是( )
A.
这是事件 A , B 的积的概率,即既刮风又下雨的概率.
B.
这是在刮风的条件下,下雨的条件概率,用条件概率的计算公式: 可得正确结果.
C.
这是在下雨的条件下,刮风的条件概率,用条件概率的计算公式: 可得正确结果.
D.
这是事件之和的概率,由概率加法公式 P ( A + B )= P ( A )+ P ( B )- P ( AB ) =
【多选题】构造原理揭示的电子排布能级顺序,实质是各能级能量高低。若以E(nx)表示某能级的能量,以下各式中正确的是 [ ]
A.
E(4s)>E(3s)>E(2s)>E(1s)
B.
E(3d)>E(4s)>E(3p)>E(3s)
C.
E(5s)>E(4f)>E(4s)>E(3d)
D.
E(5s)>E(4s)>E(4f)>E(3d)
【简答题】Fill in the blanks with the right forms of words in the box. secluded transaction distinctive jurisdiction explode He's 80 years old now and lives a very __________ life.
【简答题】American author Mark Twain once noted that “life would be surely happier if we could only be born at the age of 80 and gradually approach 18.” Twain’s words were only one of many complaints about agin...
【简答题】Read the passage and summarize the main idea and the main point of the passage into no more than 80 words. My neighbor's children love playing hide-and-seek as all children do, but no one imagine that...
【简答题】201906 T32 You can save energy by sometimes taking the bus, riding a bike, or simply (walk) _____________ .A. walking
【单选题】各种正式的沟通网络中,下列说法正确的是
B.
因链式沟通的员工满意度比轮式强,应该用链式取代轮式
【简答题】判断下列各式是否正确,不正确的请予以改正: (1) ; (2) × =4× × =4 × =4 =8。
【单选题】( )认为矫正社会工作者的任务就是要对矫正对象的不适当行为进行治疗或矫正,帮助其学习和掌握对当前环境的恰当反应模式。 A.认知理论 B.优势视角 C.行为主义理论 D.标签理论