單項(xiàng)選擇題There is not()depth of water around the area centered at the lighthouse.

A.ample
B.sufficient
C.enormous
D.incredible


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1.單項(xiàng)選擇題There shall be two principal()through the harbor for the passage of vessels of over 60 tons burden.

A.straits
B.channels
C.canals
D.roadsteads

5.單項(xiàng)選擇題To determine if a C02 fire extinguisher is fully charged, you would().

A.operate the trigger valve
B.weigh the extinguisher
C.test with a pressure gauge
D.read the date of last test