⑴After I get up, I brush my teeth.
⑵Before I have breakfast, I wash my face and hands.
⑶After I have breakfast, I walk to school.
⑷Before I have dinner, I do my homework.
⑸After dinner, I watch TV.
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小明同学用一个焦距未知的凸透镜、蜡烛、光屏、光具座探究凸透镜成像规律:
下列关于物理概念的说法中,正确的是( )
每辆自行车376元,买3辆自行车大约要多少钱,我带1300元,够吗?