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【多选题】
新生仔畜的护理工作主要包括A.
防止脐带感染
B.
保温
C.
早吃和吃足初乳
D.
预防疾病
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反馈参考答案：
举一反三
【单选题】Which of the following is not the reason why the speaker built the telescope?
A.
The telescopes are awesome
B.
To explore the universe in new ways
C.
Telescope is a new technology of astronomy
【单选题】Those instruments, such as the microscope and the telescope, which are essentially aids to the eye, have certain features______.
A.
in common
B.
by common
C.
under common
D.
among common
【单选题】The astronomers actually control the telescope in the operating room instead of being near the telescopes.
A.
Y
B.
N
C.
NG
【简答题】A．The telescope. B．The harmonica. C．The piano. D．The light bulb.
【简答题】肘关节包括 、 和 3个关节。
【简答题】A．The telescope. B．The harmonica. C．The piano. D．The light bulb.
【简答题】将上面scores数据框,进行melt()转换,以姓名,学期为识别列,以Chinese、math、english为测量列,形如: 可写作: score_melt<-_______(_______,id.vars=_____)
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