“safe speed” is defined as that speed where（）.

A.you can stop within your visibility range

B.you can take proper and effective action to avoid collision

C.you are traveling slower than surrounding vessels

D.no wake comes from your vessel

DireCtor影片（）是通过在分镜表中设置精灵的舞台上出场时间、出场位置、动作行为来实现的。

A.内容的分发

B.内容的测试

C.内容的编排

D.内容的复制