单项选择题
The objective of shoring a damaged bulkhead is to（）.
A.force the warped, bulged, or deformed sections back into place B.support and hold the area in the damaged position C.withstand subaequent additional damaged D.make a watertight seal at the damaged area
单项选择题 The official number of a documented vessel is（）.
单项选择题 The original equilibrium position is stable when（）.
单项选择题 The remote control for a fixed fire extinguishing system should be（）.
