生态形态的环境组分包括()
A、辐射
B、大气(气体)
C、生物
D、水体
E、土体
参考答案:A, B, D, E
Krashen’s ______ order hypothesis states that we acquire the rules of language in a predictable order, some rules tending to come early and other late.
RB保护投入运行不利于机组的稳定运行。()