单项选择题
A.Advection
B.Radiation fog
C.frontal fog
D.Steam fog
单项选择题 Normally the mariners care more about the（）of tide.
单项选择题 The International Association of Lighthouse authorities (IALA) buoyage system “A” uses some types of marks to distinguish safe navigation? Which type(s) does(do) not belong to the system?（）
单项选择题 Which refers to the living space for seafarers?（）