单项选择题

The permant dunnage attached to the frames of the ship that aids in ventilation is (are) the（）.

A.hatch boards
B.tank top
C.hatch beams
D.sweat bettens

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单项选择题

The productivity of working shifts can be improved through a decrease of（）.

A.working hours
B.gangs
C.idle time
D.weight per set

单项选择题

The purpose of cant frames in steel vessel is（）.

A.To support the overhang of the stern
B.To strength the plating against the pounding of the sea
C.To add srength to the deck beams which support the weather deck
D.To support the plating of a cylindrical tank