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單項(xiàng)選擇題

The device that allows a floating ship to sway without bending the marine riser system is the（）.

A.yaw joint
B.sway joint
C.slip joint
D.flex or ball joint

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單項(xiàng)選擇題

The depth over a shallow patch，（）about 1．5 miles southeastward of Nanshan Tou lighthouse，reduces to 8 meters.

A.lay
B.lies
C.being lain
D.lying

單項(xiàng)選擇題

The danger associated with using carbon dioxide in an enclosed space is（）.

A.frostbite
B.skin burns
C.asphyxiation
D.an explosive reaction