单项选择题 In the case of the leading marks，the master may（）to show these in the bill of lading if the goods or their containers are not clearly marked in such a manner as should ordinarily remain legible until the end of the voyage.

单项选择题 The development of the container system（）.

单项选择题 The use of containers will make the cargo-handling safer if（）that the man-hours of exposure to risk will decrease.