问题详情

Which of the following is true when navigation with radar during restricted visibility ().① Radar may not indicate small vessels and icebergs;② Radar may mean that safe speed is even slower due to the indication of other vessels on the scope.
A.① only
B.② only
C.Both ① and ②
D.Neither ① nor ②请帮忙给出正确答案和分析，谢谢！