单项选择题 Chemical Tankers are generally referred to the cargo ships constructed or adapted and used for the carriage of（）.

单项选择题 Before you start an engine in a compartment，it’s MOST important to（）.

单项选择题 Any oil tanker which is not required to be provided with segregated ballast tanks in accordance with this paragraph may，however，be qualified as a segregated ballast tanker （）it complies with the other requirements of paragraphs of this Convention.