单项选择题
A.from areas equipped with power ventilation
B.only from enclosed areas free from sources of vapor ignition
C.from the open deck
D.from within the vessel
单项选择题 Access to a cargo pumproom on a tanker carrying grades A，B，C or D liquid cargoes shall be（）.
单项选择题 A vessel has an amidships superstructure. Which location would be most suitable for on-deck stowage of automobiles?（）.
单项选择题 A towing vessel pushing a barge ahead and rigidly connected in a composite unit shall show the lights of（）.