Ccsds adopts two levels multiplexing mechanism to realize multi - user dynamically common channel Ccsds采用多路复用机制实现多用户动态分享信道。
As a study method penetrating into teaching of different subjects , inquiry learning is the common channel to carry out the research study 研究性学习作为一种学习方式贯穿在学科教学之中,是实施研究性课程的普遍渠道。