p区的轻元素常常与较重的元素在物理和化学性质方面有着不同。通过比较讨论下列各项的相同点和不同点
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Explain why aluminium(III )is the only stable oxidation state of aluminum in this compounds,in contrast to thallium,which has states of+1 and+3.
Explain the structure of C3O2in terms of the bonding in the molecule.
Th1细胞主要分泌的细胞因子—IL-2
A. IL-1
B. IL-2
C. IL-3
D. IL-4
E. IL-5
女,33岁右下肢浅静脉迂曲扩张,长期不予外理,并发症不包括
A. 皮肤萎缩
B. 皮肤和皮下硬结
C. 难愈性溃疡
D. 色素沉着
E. 足趾坏死