单项选择题
In a crossing situation，the stand-on vessel should normally（）.
A.take action to cross ahead of the other vessel B.take action to pass astern of the other vessel C.maintain course and speed D.change course and increase speed
单项选择题 You may find the time of slack water after low water in a certain port from（）.
单项选择题 The satellite system of GAMDSS comprise（）.
单项选择题 The terrestrial system of GMDSS consists of（）.
