問題詳情

21. How often manual steering should be tested while automatic pilot is in use?
(A) At least once a day.
(B) At least twice a day.
(C) At least once a watch.
(D) At least twice a watch.

參考答案

答案：C
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)