（）, so they are widely used on board ship nowadays.

How long must the records of tests and inspections of fire fighting equipment on board a ship be retained on board?（）

Chemical Tankers are generally referred to the cargo ships constructed or adapted and used for the carriage of（）.

Which portable fire extinguisher should be used on a class C fire on board a vessel?（）

When a tug is pulling on a hawser at right angles to the ship，and the pilot wants to come ahead or astern on the ship’s engine，care must be taken that the pilot（）.

You are kindly requested to supply the necessary tallymen to do（）on board the ship during the discharging of the cargo.

You are creating a custom user control. The custom user control will be used on 10 Web Forms for an ASP.NET Web site that allows users to register and log on to a personalized experience.The custom user control uses two TextBox controls and two Button controls.You need to ensure that the controls are visible only when users are not logged on to the Web site. You also need to minimize the amount of effort in development and maintenance for the Web site. Which two actions should you perform?（）

The （） stage air compressors are widely used on board the ship.

（）, so they are widely used on board ship nowadays.

If passengers are on board when an abandon ship drill is carried out，they should（）.

Regulations require certain records to be retained on board for at least 3 months after a ship is involved in a casualty or until advised that they are no longer needed on board by the （）.

Compensated flow control or constant flow valves are used in hydraulic systems to（）