221. A line connecting all possible positions of your vessel at any given time is a ______.
举一反三
- at any (given) time
- All of the following are engaged in fishing EXCEPT（）. A: A vessel trawling B: A vessel trolling C: A vessel setting nets D: A vessel tending line
- If your vessel is aground at the bow，it would be preferable that any weight removals be made from the（）.
- How to design your graphs in your journal paper?( ). A: Make each line on a graph as easily distinguishable as possible B: Extend the axis as far as possible C: Draw as many lines inside a graph as possible
- 中国大学MOOC: Has your teacher given you any advice ____ your study