問題詳情

20.Akind of services designed to improve the safety and efficiency of vessel traffic and to protect the environment, we call it as .
(A)TSS
(B)VTS
(C)UTC
(D)ITZ

參考答案

答案：B
難度：非常簡單0.978022
統計：A(1),B(89),C(1),D(0),E(0)