单项选择题
SOLAS regulations require that the inert gas system shall be capable of delivering inert gas with an oxygen content of not more than what percentage?（）
A.5% B.8% C.6% D.3%
单项选择题 SOLAS stands for（）
单项选择题 The ISPS Code is a part of （）
单项选择题 The ISM Code is a part of （）
