An “on-load” release system on a survival craft means the cable can be released（）.

Air circulation is caused or affected by（）.

In handling break bulk hazardous materials，it is forbidden to use（）.

An advantage of using chain lashing on heavy vehicles aboard Ro-Ro vessels is that it（）.

All personnel on board a vessel should be familiar with the rescue boat’s（）.

All Loran-C transmitting stations are equipped with cesium frequency standards which permit （）.

An indirect radar echo is caused by a reflection of the main lobe of the radar beam off the observer’s vessel. Which of the following is NOT a characteristic of indirect echoes? （）

In respect of carrier’s liabilities，responsibilities，rights and immunities the（）contained in the International Convention for the Unification of Certain Rules Relating to Bills of Lading，signed at Brussels on August 25，1924，shall be applied.

An icebreaker may use the code letter “K” to remind ships of their obligation to listen continuously on their radio. This signal may be made by any of the following EXCEPT（）.

Explosive and flammable gasses are most likely to be encountered on a vessel（）.