问题
单项选择题
Compared to internal structural plating，the exterior hull plating on a ship is usually（）.
A.per
B.thinner
C.more corrosion resistant
D.a lower grade steel
答案
参考答案：A
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Compared to internal structural plating，the exterior hull plating on a ship is usually（）.
A.per
B.thinner
C.more corrosion resistant
D.a lower grade steel
参考答案：A