InspectionofaHalonextinguisherinvolvescheckingthehose，handle，nozzle，and（）.
A. sightglass
B. weighingtheextinguisher
C. servicetechniciansreport
D. lastdateitwascharged
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OfficialproofofanAmericanvessel’snationalityiscontainedinthe（）.
A. CertificateofInspection
B. OfficialLog
CertificateofDocumentation
D. ShippingArticles
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
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