按受体在细胞的分布不同,可将激素分为()和()。
参考答案:膜受体激素;胞内受体激素
To reduce emissions of greenhouse gases, many countries are increasing the use of natural gas, wind and other forms of _______ energy.
A.abandoned
B.original
C.alternative
D.precious
TD—LTE所采用的关键技术是哪些?