单项选择题
An oiler was badly burned and you are communicating with a passenger ship that has a doctor and hospital on board. You want to rendezvous in a certain position so the oiler can be evacuated for medical treatment. Which code should your message contain?（）
A.MAF B.MAB C.MAA D.MAE
单项选择题 An isotherm is（）.
单项选择题 An intermediate spring is（）.
单项选择题 An instrument that maintains a continuous record of humidity changes is called a（）.
