单项选择题
Navigational marks used for informational or regulatory purposes are（）.
A.solid yellow B.white with orange geometric shapes C.red and white vertically-striped D.green and red horizontally-banded
单项选择题 Most totally enclosed lifeboats are equipped with which of the following? （）
单项选择题 May I have a copy of the cargo plan?Certainly，here（）.
单项选择题 Masts and derricks of cargo ships are made of（）.
