There is ________ Ocean-going Vessel in the harbor.

【名词&注释】

金属表面层、加工硬化层

[单选题]There is ________ Ocean-going Vessel in the harbor.

A. a
B. the
C. an
D. about

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学习资料：

[单选题]对金属表面层的分类，属于外表层的是( )。Ⅰ.吸附气体层;Ⅱ.污染层;Ⅲ.氧化层;Ⅳ.加工硬化层;Ⅴ.基体。

A. Ⅰ
B. Ⅰ+Ⅱ
C. Ⅰ+Ⅱ+Ⅲ
D. Ⅰ+Ⅲ

[单选题]海关官员

A. customs officer
B. chief officer
C. immigration officer
D. second officer

[单选题]inspection

A. 检查
B. 巡视
C. 参观
D. 询问

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