下列关于LoRa技术的说法正确的有
A. LoRa调制解调器采用隐式和显式两种数据包格式
B. LoRa数据包包含前导码、可选报头、数据有效负载
C. 扩频因子取值为7-14
D. 带宽越小则距离超近
Translate "小学"
A. Primary school/ Elementary school
B. Junior middle school/ Junior high school
C. Senior middle school/ Senior high school
D. College/ University.
We think you are very photogenic and would be suitable _____our Casting Division .
A. to
B. for
C. of
D. in
Where can a kindergarten student have a meal?
A. Playground
B. Dinning hall
C. Dormitory
D. Craft room