Should a person be overcome due to lack of oxygen and high concentration of refrigerant, treat with（）.

For details of these and other lights the larger scale charts and Admiralty Lists should be （）.

Practice 1　　No one knows what time itself is. We cannot see it. We cannot touch it. We cannot hear it. We know it only by the way we mark its passing. For all our success in measuring the tiniest parts of time, time remains one of the great mysteries of the universe.　　One way of thinking about time is to imagine a world without time. There could be no movement, because time and movement cannot be separated. A world without time could exist only as long as there were no changes. For time and change are linked. When something changes, you know time has passed.

A semisubmersible rig under tow should be ballasted down if（）.

To determine the pressure and temperature limitations under which LFG is required to be transported on a barge，you should look at the（）.

（）may be defined as a departure without justification and under no necessity from the proper and usual course of an agreed voyage，whereby the character and the incidents of such voyage are altered.

Should the vessel have no deratisation certificate at the time of her delivery，she（）be held to be unseaworthy.

Repair of vital machinery and services on a ship should be accomplished（）.

After an explosion，repair of emergency machinery and services should be accomplished（）.

ECDIS should be capable of（）all chart information necessary for safe and efficient navigation originated.

The tallying of cargo refers to such kind of work that the amount and condition of all cargo should be checked（）.

Under which two circumstances should Spanning Tree Protocol be implemented?（）