A: CH4
B: C2H5OH
C: C6H12O6
D: K2CO3
下列关于胰岛素的合成、加工、运输和分泌的叙述中错误的是( )
In India,about_____ of people live in the country and some of them live a very poor life.
常见的太阳能装置有:____、____。
家鸽进行气体交换的部位是( )