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【多选题】
下列选项属于危险化学品管理要求的是（）
A.
选用无害或危害性小的化学品替代已有的有毒有害化学品
B.
应根据危险性，对危险化学品进行分类管理
C.
应贴安全标签。表述危险化学品的危险特性及安全处置注意事项
D.
采用物理方式将危险化学品与人员隔离开
E.
应有安全技术说明书。详细描述危险化学品的燃爆、毒性和环境危害，以及安全防护、急救措施、运、泄漏应急处理、法规等方面信息
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举一反三
【单选题】In a hypothesis test comparing two population means, we use the z distribution when:
A.
the two population standard deviations are equal.
B.
both populations have at least 4000 observations.
C.
both population standard deviations are known.
D.
nπ and n(1-π) are both greater than 5.
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【单选题】In a hypothesis test comparing two population means, the "=" sign always appears in the ( )
A.
null hypothesis.
B.
alternative hypothesis.
C.
upper tail of one-tailed hypothesis testing.
D.
lower tail of one-tailed hypothesis testing.
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】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
【单选题】In a hypothesis test comparing two population means, the "=" sign always appears in the:
A.
null hypothesis.
B.
alternate hypothesis.
C.
upper tail of the test statistic.
D.
lower tail of the test statistic.
查看完整题目与答案
【多选题】法洛四联征在胸部后前位片上的X线表现为( )
A.
心脏无明显增大
B.
肺门缩小，肺血管纤细
C.
心尖圆钝、上翘、心腰凹陷
D.
肺血少者可能见到侧支循环
E.
伴有右位主动脉弓则主动脉结在右侧
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
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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.
查看完整题目与答案
相关题目：
【单选题】In a hypothesis test comparing two population means, we use the z distribution when:
A.
the two population standard deviations are equal.
B.
both populations have at least 4000 observations.
C.
both population standard deviations are known.
D.
nπ and n(1-π) are both greater than 5.
查看完整题目与答案
【单选题】In a hypothesis test comparing two population means, the "=" sign always appears in the ( )
A.
null hypothesis.
B.
alternative hypothesis.
C.
upper tail of one-tailed hypothesis testing.
D.
lower tail of one-tailed hypothesis testing.
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】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
【单选题】In a hypothesis test comparing two population means, the "=" sign always appears in the:
A.
null hypothesis.
B.
alternate hypothesis.
C.
upper tail of the test statistic.
D.
lower tail of the test statistic.
查看完整题目与答案
【多选题】法洛四联征在胸部后前位片上的X线表现为( )
A.
心脏无明显增大
B.
肺门缩小，肺血管纤细
C.
心尖圆钝、上翘、心腰凹陷
D.
肺血少者可能见到侧支循环
E.
伴有右位主动脉弓则主动脉结在右侧
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