单项选择题
Our starboard derrick boom of hatch No.4 is badly cracked（）that it has become entirely useless.
A.at its goose neck to such a extent B.at it's goose neck to such an extent C.at it's goose neck for such a extent D.at its goose neck to such an extent
单项选择题 Our ship is more than 150 meters in（）.
单项选择题 Our jumbo boom can（）20 tons.
单项选择题 On which type davit does the davit head stay at the same height?（）
