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【简答题】
Because women often restrict their diet in an effort to control weight, they may no consume enough iron-rich food and ____ experience an iron deficiency.
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【简答题】We’re going to have interesting ___11____ in the school library at 8:00 am on November 20,2002. By then, some of us will read ___12____ and some will tell stories. You can also hear ___13____ singing ...
【单选题】The boy ____ by the senior students because he walked in the school without any shoes. 绿本练习2
A.
was laughing
B.
was laughed at
C.
laughed at
【单选题】根据玻尔理论, 氢原子系统的总能量就是
A.
原子系统的静电势能之总和
B.
电子运动动能之总和
C.
电子的静电势能与运动动能之总和
D.
原子系统的静电势能与电子运动动能之总和
【多选题】根据玻尔氢原子理论, 以下说法正确的是
A.
氢原子系统的总能量就是电子的静电势能与运动动能之总和
B.
氢原子系统的总能量原子系统的静电势能与电子运动动能之总和
C.
氢原子的总能量为负 , 说明电子被原子核所束缚
D.
当电子绕核作加速运动时 , 会向外辐射电磁能量
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