单项选择题
A chock（）.
A.is a deck fitting used to shackle gear to the deck B.permits easy jettisoning of deck cargo in an emergency C.prevents stress concentration in the bulwark D.provides openings through the bulwark for mooring lines
单项选择题 A hydrostatic release mechanism for a liferaft（）.
单项选择题 A CLEARLY MARKED WAY IN THE VESSEL WHICH HAS TO BE FOLLOWED IN CASE OF AN EMERGENCY defines（）.
