单项选择题

Atmospheres 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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单项选择题

A venetian vent or rice ventilator is used in stowage of which cargo?（）.

A.Bagged cargo
B.Bulk grain
C.Bulk rice
D.Refrigerated goods

单项选择题

A grapnel is a（）.

A.device for securing a chain topping lift
B.hook to prevent the anchor cable from slipping
C.device used to drag for a submerged cable or line
D.type of clam bucket used for discharging bulk cargo

单项选择题

A deck beam does NOT（）.

A.act as a beam to support vertical deck loads
B.lessen the longitudinal stiffness of the vessel
C.act as a tie to keep the sides of the ship in place
D.act as a web to prevent plate wrinkling due to twisting action on the vessel