OfficialproofofanAmericanvessel’snationalityiscontainedinthe（）.
A. CertificateofInspection
B. OfficialLog
CertificateofDocumentation
D. ShippingArticles
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Withreferencetoarotaryvanesteeringgearsystem,whichoneofthefollowingstatementsistrue?（）
A. Thethreemovingvanesandthethreefixedvanesformthreepressurechambers
B. Thethreemovingvanesandthethreefixedvanesformsixpressurechambers
C. Thethreemovingvanesandthethreefixedvanesformninepressurechambers
D. Thethreemovingvanesandthethreefixedvanesformtwelvepressurechambers
Recordsoftestsandinspectionsofacargovessel’sfireextinguishingsystemsshallbekeptonboard（）.
A. for1year
B. for2years
C. untilthenextCoastGuardinspection
D. untilthevessel'sCertificateofInspectionexpires
Largepipesordown-comersarefittedbetweenthesteamdrumand（）toensuregoodnaturalcirculationofwater.
A. fire-tubes
B. furnaces
C. waterdrums
D. waterwalltubes
Spontaneousignitioncanresultfrom（）.
A. anunprotecteddrop-lightbulb
B. carelessdisposalorstorageofmaterial
C. smokinginbed
D. wornelectricalwiresonpowertools
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