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【简答题】
一个盒子里装有4张大小形状完全相同的卡片，分别标有数2，3，4，5；另一个盒子也装有4张大小形状完全相同的卡片，分别标有数3，4，5，6．现从一个盒子中一张卡片，其上面的数记为x；再从另一盒子里一张卡片，其上面的数记为y，记随机变量η=x+y，求η的分布列和数学期望．
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【单选题】People began to add rubber and steel between the buildings and its base so as to____.
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【单选题】Shangri-la, which is _______ happy home for the local people, is also ________ home to many birds and animals.
A.
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B.
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D.
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【单选题】Nowadays, many people________about eating habits _________what they believe.
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take choices; base on
B.
make choices; based on
C.
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【单选题】油发是将适合于油发的含胶原蛋白充足原料，在油中（），使其变性膨胀的方法。
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浸泡
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E.
产后预防出血及感染
查看完整题目与答案
【单选题】协调性宫缩乏力的处理要点,下列错误的是
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做阴道检查，了解胎方位及头盆相称程度
B.
有头盆不称者应行剖宫产术
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无头盆不称者应静脉滴注缩宫素加强宫缩
D.
宫口开全，双顶径达坐骨棘水平以上者，可阴道手术助产
E.
产后预防出血及感染
查看完整题目与答案
【单选题】La Paz is an ideal place for shopping, because there______.
A.
people can buy whatever they want to
B.
people don't have to fulfill their duties
C.
people don't have to pay tax for their shopping
D.
people can buy things at reduced price
查看完整题目与答案
【单选题】People began to add rubber and steel between the buildings and its base so as to____.
A.
Make the building flexible
B.
Make the building firm
C.
To decrease the effects of the vibration
D.
To avoid the earthquake
查看完整题目与答案