厦门海测时通过观察CDS路测工具上的()可以判断只有单流下行。
A.PCI,
B.Rank,
C.MCS,
D.RSRP.
参考答案:B
A _______schoolboy, Li Lida first tried to cross the Qiongzhou Channel in June 2000. [ ]
A. 12-year old
B. 12-year-old
C. 12-years-old
D. 12 years old