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【判断题】
单相异步电动机的主要结构包括定子,转子、机座以及端盖等。
A.
正确
B.
错误
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【单选题】Men have traveled ever since they flint appeared on earth. In primitive times they did not travel for pleasure but to【C1】______new places where their herds could feed, or to escape from【C2】______neigh...
A.
visit
B.
find
C.
buy
D.
investigate
【单选题】钢材工件校削余量小,口不锋利,使孔径缩小而产生误差的原因是加工时产生较大的( )。
A.
切削力
B.
弯曲
C.
弹性恢复
D.
弹性变形
【简答题】D irection: mark key words in red and devide the paragraph in meaning cluster. Scientists have proposed numerous theories to explain the sudden extinction of most the animal and plant life on Earth at...
【单选题】下列各项不属于舱壁作用的是:
A.
增加抗沉性
B.
控制火灾蔓延
C.
有利于不同货种的分隔积载
D.
提高舱容利用率。
【简答题】On earth, where fog or rain would interfere with transmission, lasers would have to be beamed through evacuated pipelines to pr power loss.
【单选题】产生视差的原因是( )。
A.
观测时眼睛位置不正确
B.
目镜调焦不正确
C.
前后视距不相停
D.
物像与十字位分划板平面不重合
E.
原因不详
【单选题】儿童室内温度、湿度,下列正确的是
A.
新生儿温度为22~24℃,湿度为50%~60%
B.
婴幼儿温度为20~22℃,湿度为50%~60%
C.
儿童温度为20~22℃,湿度为55%~65%
D.
婴幼儿温度为20~22℃,湿度为55%~65%
E.
儿童温度为18~20℃,湿度为55%~65%
【简答题】There is a place on our earth where hot water and steam come up under the ground. It is on a large island in the Pacific Ocean. The island is North Island in New Zealand. The planet on which we live i...
【简答题】下列各项不属于舱壁作用的是( )
【单选题】利雅得和北京产生时差的原因是( )
A.
纬度差异
B.
地球自转
C.
大气运动
D.
太阳活动
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