A:胆固醇、脂肪酸、脂肪酶
B:淀粉、半乳糖、糖原
C:氨基酸、核苷酸、麦芽糖
D:性激素、脱氧核糖、胰岛素
①S1+S2=S3+S4;②S2+S4=S1+S3;③若S3=2S1,则S4=2S2;④若S1=S2,则P点在矩形的对角线上.
其中正确的结论的序号是____(把所有正确结论的序号都填在横线上).
- Tom, you look tired this morning. What's wrong?
- I was busy and I didn't go to bed _________ 12 o'clock last night
It's not proper for kids to have too much pocket money because they may buy ______.