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【单选题】
2 《中国居民膳食营养素参考摄入量 第3部分:微量元素》对14-18岁的硒元素推荐摄入量为( )
A.
20ug/天
B.
40ug/天
C.
60ug/天
D.
80ug/天
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【单选题】在d轴定向于转子磁链矢量的同步旋转坐标系中,如能保持转子磁链大小不变,则电磁转矩与定子电流的q轴分量成( )关系。
A.
平行
B.
反比
C.
正比
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【单选题】在d轴定向于转子磁链矢量的同步旋转坐标系中,如能保持转子磁链大小不变,则电磁转矩与定子电流的q轴分量成()关系。
A.
正比
B.
反比
C.
平行
D.
垂直
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【单选题】Why did Magellan call the ocean the Pacific?
A.
Because he finally got to it.
B.
Because it was a new ocean.
C.
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D.
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A.
Because it can help human beings to make more amazing discoveries.
B.
Because healthy ocean can help reduce the growing burden our population is placing on this planet.
C.
Because we can know about how the ocean can provide for people.
D.
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A.
She thinks it's beautiful.
B.
She can't see a view of the ocean.
C.
We don't know.
【简答题】按下列要求画图。 (1)画出一个角关于直线l对称的图形; (2)画出四边形关于一边中点O对称的图形。
【简答题】Why did Magellan call the ocean the Pacific?A. Because he finally got to it. B. Because it was a new ocean. C. Because it was called the Pacific then. D. Because after struggles crossing the Atlantic,...
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