单项选择题
The payment proportionate to the part of the voyage accomplished or to the part of the cargo delivered is referred as（）.
A.advance freight B.back freight C.dead freight D.pro rata freight
单项选择题 The patches where rust have been removed should be wiped clean before paint is（）.
单项选择题 The necessity of the segregation of cargoes is determined by（）.
单项选择题 The National Cargo Bureau represents the（）.
