Which of the following shall not the officers in charge of the navigational watch do?（）

A tide is called diurnal when（）.

In the Northern hemisphere northerly winds may cause temperature（）.

The dew point temperature is（）.

It is dangerous for vessels without the operational radar（）the estuary.

Before any loading takes place any signs of the previous cargo should do（）.

（）is halfway between the forward and after perpendiculars and is reference point for vessel construction.

Which of the following is not an operation mode of AIS?（）

When steering by autopilot,how often should the steering be checked?（）

Where would you find information about the time of high tide at a specific location on a particular day of the year?（）