![](https://lstatic.shangxueba.com/jiandati/pc/images/pc_jdt_tittleico.png)
A microphone is device for picking up sounds.
![](https://lstatic.shangxueba.com/jiandati/pc/images/jdt_panel_vip.png)
![](https://lstatic.shangxueba.com/jiandati/pc/images/no_answer.png)
表示正态分布的资料中数据的离散程度最常用的指标为
A.mean
B.vanance
C.percentile
D.standard deviation
E.coefficient of variation
11岁儿童的身高与体重的两组数据的变异程度大小可用
A.mean
B.vanance
C.percentile
D.standard deviation
E.coefficient of variation
The _______ can help people to see very small objects.
A、metropolitan
B、microphone
C、microscope
D、microwave
A.A projector and a wireless microphone.
B.A PowerPoint projector and an overhead projector.
C.A projector and a microphone on the podium.
D.A wireless microphone and a microphone on the podium.
A、shout out with the largest volume
B、murmur to yourself
C、put the microphone near to your mouth as close as possible
D、put the microphone near to your mouth but with a distance of about 3-5cm
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