单项选择题
The freight will not be payable（）the goods are delivered in such a condition that they are substantially and in a mercantile sense the same goods as those shipped.
A.if B.whether C.when D.unless
单项选择题 The fittings used to secure a watertight door are known as（）.
单项选择题 Regulations concerning the stowage，lashing，and securing of timber deck cargoes aboard general cargo vessels may be found in the（）.
单项选择题 Progressive flooding is controlled by securing watertight boundaries and（）.
