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【单选题】
第一胎足月自娩，胎盘30分钟未娩出，检查子宫下一狭窄环，使胎盘嵌顿于宫腔内。此时应采用的适当方法是（）
A.
按摩子宫底压出胎盘
B.
肌肉注射镇痛剂徒手取胎盘
C.
麻醉下手取胎盘
D.
大号刮匙刮取胎盘
E.
行子宫切除术
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举一反三
【判断题】外在的情绪表现通常称之为表情,包括面部表情、姿态表情和语调表情。( )
A.
正确
B.
错误
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【简答题】媒介文化引导消费,体现在哪些方面
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【单选题】In a one-tailed hypothesis test:
A.
the rejection region is in only one of the tails of a distribution.
B.
the rejection region is split between the tails of a distribution.
C.
the area of the rejection region equals the p-value.
D.
the area of the rejection region is twice the value of the p-value.
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【单选题】In performing a hypothesis test where the null hypothesis is that the population mean is 23 against the alternative hypothesis that the population mean is not equal to 23, a random sample of 17 items ...
A.
17
B.
16
C.
15
D.
2
E.
1
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【单选题】To use a z statistic in a one-sample hypothesis test of a mean, we need to know:
A.
the population mean.
B.
the population standard deviation.
C.
the degrees of freedom.
D.
the margin of error.
查看完整题目与答案
【判断题】外在的情绪表现通常称之为表情。()
A.
正确
B.
错误
查看完整题目与答案
【多选题】我国居民目前主要选择的投资方式包括()
A.
存款储蓄
B.
债券
C.
股票
D.
保险
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【单选题】In a hypothesis test comparing two means of the independent normal populations, we use the z distribution test statistic when ( )
A.
both population standard deviations are known.
B.
the two population standard deviations are unkown.
C.
the two population standard deviations are equal.
D.
Both B and C
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【单选题】某工作在放大状态的三极管,当基级电流IB由60μA降低到40μA时,集电极电流IC由2.3mA降低到1.5mA,则此三极管的动态电流放大系数β为( )。
A.
37.5
B.
38.3
C.
40
D.
57.5
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【单选题】Which of the following statements is NOT true about the level of significance in a hypothesis test?
A.
The larger the level of significance, the more likely you are to reject the null hypothesis.
B.
The level of significance is the maximum risk we are willing to accept in making a Type I error.
C.
The significance level is also called the level.
D.
The significance level is another name for Type II error.
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相关题目：
【判断题】外在的情绪表现通常称之为表情,包括面部表情、姿态表情和语调表情。( )
A.
正确
B.
错误
查看完整题目与答案
【简答题】媒介文化引导消费,体现在哪些方面
查看完整题目与答案
【单选题】In a one-tailed hypothesis test:
A.
the rejection region is in only one of the tails of a distribution.
B.
the rejection region is split between the tails of a distribution.
C.
the area of the rejection region equals the p-value.
D.
the area of the rejection region is twice the value of the p-value.
查看完整题目与答案
【单选题】In performing a hypothesis test where the null hypothesis is that the population mean is 23 against the alternative hypothesis that the population mean is not equal to 23, a random sample of 17 items ...
A.
17
B.
16
C.
15
D.
2
E.
1
查看完整题目与答案
【单选题】To use a z statistic in a one-sample hypothesis test of a mean, we need to know:
A.
the population mean.
B.
the population standard deviation.
C.
the degrees of freedom.
D.
the margin of error.
查看完整题目与答案
【判断题】外在的情绪表现通常称之为表情。()
A.
正确
B.
错误
查看完整题目与答案
【多选题】我国居民目前主要选择的投资方式包括()
A.
存款储蓄
B.
债券
C.
股票
D.
保险
查看完整题目与答案
【单选题】In a hypothesis test comparing two means of the independent normal populations, we use the z distribution test statistic when ( )
A.
both population standard deviations are known.
B.
the two population standard deviations are unkown.
C.
the two population standard deviations are equal.
D.
Both B and C
查看完整题目与答案
【单选题】某工作在放大状态的三极管,当基级电流IB由60μA降低到40μA时,集电极电流IC由2.3mA降低到1.5mA,则此三极管的动态电流放大系数β为( )。
A.
37.5
B.
38.3
C.
40
D.
57.5
查看完整题目与答案
【单选题】Which of the following statements is NOT true about the level of significance in a hypothesis test?
A.
The larger the level of significance, the more likely you are to reject the null hypothesis.
B.
The level of significance is the maximum risk we are willing to accept in making a Type I error.
C.
The significance level is also called the level.
D.
The significance level is another name for Type II error.
查看完整题目与答案