某班的同学正在上体育课,男同学跑1500米时所需的主要能源和最终能源依次是?( )
A:太阳能、糖类
B:糖类、脂肪
C:脂肪、太阳能
D:糖类、太阳能
小明最爱吃的一种钙片,一瓶装有186片,按规定每天两次,每次三片,这瓶该片能吃
____天。
根据句子意思和首字母提示完成单词。
如图所示是奥斯特实验的示意图.接通电路后观察到的现象是____,由此实验得到的结论是____ .如果移走小磁针,该结论____ (选填“成立”或“不成立”).
根据短文理解,选择正确答案。
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