单项选择题
A.Cargoes are any type of goods transported by any type of ships
B.Cargoes are goods transported in bulk
C.Cargoes usually include goods transported in bulk and in containers
D.Cargoes are usually packaged in containers
单项选择题 Before work is commenced（）,the officer responsible should inform the duty en-gineer to ensure that steps are taken to reduce as far as practicable the emission of steam, harmful gases and fumes.
单项选择题 Before wore is commenced（）the officer responsible should ensure that power is shut off and warning notices posted on the bridge and in the machinery spaces.
单项选择题 Personnel working aloft (above 2metres) should wear（）or other arresting device at all times.