单项选择题 You notice smoke coming from an open laundry room doorway．After activating the fire alarm，which of the following would you do FIRST（）.

单项选择题 You are underway and pass by a lighthouse.Its light，which was white since you first sighted it，changes to red．This means（）.

单项选择题 You are docking a vessel starboard side to with the assistance of two tugs.You are attempting to hold the vessel off by operating both tugs at right angles to the vessel and at full power.You must ensure that（）.