均匀的正四面体的各面标有1,2,3,4四个数字,连续掷两次,求与地面接触的数字之

题型:解答题

问题:

均匀的正四面体的各面标有1,2,3,4四个数字,连续掷两次,求与地面接触的数字之和为4的概率,小刚和小颖分别给出了下述两种不同的
小刚的解法:两数字之和共有2,3,4,5,6,7,8,这7种不同的结果,因此所求的概率为
1
7

小颖的解法:连续掷两次正四面体,共有16种可能的结果,其中数字之和为4的情况有
(1,3),(2,2),(3,1)3种,因此数字之和为4的概率为
3
16
,请问哪一种解法正确?为什么?
考点:列举法求概率
题型:解答题

不符合原发性血小板减少性紫癜的实验室检查结果是()

A.BT延长

B.血小板计数减少

C.PT延长

D.血块收缩不良

E.平均血小板体积增大

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Giacomo Puccini was born in 1858 and was a son of a musical director. __ 小题1:    He is remembered as a master of opera.

   小题2:    Many early forerunners of Impressionistic Music including Rimsky-Korsakov, Strauss, Schoenberg and Stravinsky, inspired him greatly.

Turandot, an opera based on an Italian drama by the same name, is by far considered to be one of Puccini’s most popular and most performed works.

It’s a pity that Puccini had no chance to watch his own great opera himself.     小题3:    

In this opera you can hear a traditional Chinese folk song, which is titled Molihua(茉莉花)or Jasmine Flower.     _____小题4:____ Among them the version sung in Jiangsu, a province in south China, is the most popular one. By admiring the jasmine flower, the song celebrates the sweetness and beauty of romantic love.     小题5:    In 1804 the song was published in a book by a British diplomat(外交官), making it the first Chinese folk song that gained popularity outside China.

A.During his music career, Puccini was also influenced by other musicians.

B.At the end of the 18th century, it was first translated into English.

C.Though Puccini received training in various areas of music, his true love was in opera.

D.Puccini’s operas are strong in emotion and conflict.E. Turandot is performed regularly all over the world.

F. The opera was first performed in 1926, two years after Puccini’s death.

G. There are many different versions of Molihua or Jasmine Flower in different parts of China.

题型:解答题

上门服务业务开办前,必须与客户签订相关的上门服务协议,明确双方()。

A.职责

B.责任

C.权利

D.义务

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某省对本省建筑市场进行整顿,发现以下单位和个人有违规行为,对此依据《建设工程安全生产管理条例》应分别采取何种处罚?

野原市友好饭店在饭店扩建时,为尽快恢复营业要求施工单位压缩合同约定的工期,所幸未造成重大安全事故,对此应()。

A.责令限期改正,处20万元以上50万元以下的罚款

B.责令限期改正,给予警告

C.责令限期改正,处1万元以上5万元以下的罚款

D.责令限期改正,处1万元以下的罚款

题型:解答题

下列选项中,__(1)__和__(2)__是存储媒体,__(3)__和__(4)__是表示媒体。

空白(4)处应选择()

A.图像编码

B.声音编码

C.键盘

D.ROM

E.电缆

F.磁盘

G.显示器

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