单项选择题
A.Good navigational knowledge and a professional job attitude
B.Good computer knowledge
C.Good system knowledge
D.Nothing special
单项选择题 If the rotation for this vessel is Felixstowe,Antwerp,Le Havre,Hamburg and Rotterdam.The container for Rotterdam is right at the（）of the heap.
单项选择题 All charts and publications should be kept up to date with the（）amendments
单项选择题 In particular,which is not included in the Navigation System?（）