單項(xiàng)選擇題Atmosphere laden with coal dust or grain dust caused by loading these cargoes（）.

A.require loading operations to be shut down until the atmosphere clears
B.are toxic to human life
C.are subject to spontaneous combustion
D.may be explosive in some concentrations


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1.單項(xiàng)選擇題Bags are usually stowed in between the bulk grain（）.

A.to ventilate the hold
B.to separate the cargo
C.to replace shifting boards
D.to facilitate stowage

2.單項(xiàng)選擇題Battens are fitted in cargo holds across the frames of the vessel from the turn of the bilge upward. The purpose of these cargo battens is（）.

A.for securing a snatch block when snaking cargo into the wings of the hold
B.to prevent cargo from coming in contact with the vessel's frames or shell plating
C.tp prevent fittings to which cargo lashing may be secured
D.to support the dunnage floors which are laid down between tiere of cargo

3.單項(xiàng)選擇題Beams are cambered to（）.

A.increase their strength
B.provide drainage from the decks
C.relieve deck stress
D.All of the above

4.單項(xiàng)選擇題Because of the arrangement of the cell guuides, the most important factor while loading containers is the（）.

A.contents of the container
B.list of the vessel
C.size of the shoreside crane
D.weight of the container

5.單項(xiàng)選擇題Before loading bulk grain, bilge wells must be covered to（）.

A.add strength to the bilge well strainer
B.permit rapid flow of water to the bilge wells
C.prevent cargo sifting into the bilge wells
D.preven oil, water , or other liquid from reaching the cargo