最基本的保护层是油漆。（）<br>A:The principal protective coating is paint.<br>B:The principal protective coating is cement wash.<br>C:The principal protective coating is bitumen.<br>D:The principal protective coating is varnish.

最基本的保护层是油漆。（）
A:The principal protective coating is paint.
B:The principal protective coating is cement wash.
C:The principal protective coating is bitumen.
D:The principal protective coating is varnish.

出自：船舶水手证

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