单项选择题
Holes in the bulwark，which allow deck water to drain into the sea，are（）.
A.doggers B.fidleys C.freeing ports D.swash ports
单项选择题 Gross tonnage indicates the vessel’s（）.
单项选择题 Grinding to eliminate shallow surface defects should be done（）.
单项选择题 Fuel oil tank vents are fitted with a screen which will stop（）.
