單項(xiàng)選擇題

The minimum concentration of a vapor in air which can form an explosive mixture is called the（）.

A.auto-ignition point
B.flash point
C.lower explosive limit (LEL)
D.threshold limit value (TLV)

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單項(xiàng)選擇題

The minimum amount of lifesaving equipment required aboard an 85-foot uninspected towing vessel consists of（）.

A.one approved flotation cushion for each person on board
B.one approved life preserver for each person on board and one life ring
C.one approved inflatable vest for each person on board
D.lifeboat capacity equal to 1 1/2 times the number of persons on board

單項(xiàng)選擇題

The MINIMUM acceptable size for a towing bridle would be that size in which the safe working load (SWL) of each leg of the bridle is equal to（）.

A.one-half the SWL of the main towing hawser
B.three-fourths the SWL of the main towing hawser
C.that of the main towing hawser
D.twice that of the main towing hawser

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