most of the machinery ___board our ship are of our own desin and making.1on 2 at 3 in 4of
问题描述：
most of the machinery ___board our ship are of our own desin and making.1on 2 at 3 in 4of
选哪个 为什么
答
1 on
on board在船（车、飞机）上 再如：
The cargo on board have been damaged by sea water.
船上的货物因水湿而残损.
来自《现代汉英综合大词典》
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