题目内容

Largepipesordown-comersarefittedbetweenthesteamdrumand（）toensuregoodnaturalcirculationofwater.

A. fire-tubes
B. furnaces
C. waterdrums
D. waterwalltubes

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Largepipesordown-comersarefittedbetweenthesteamdrumand（）toensuregoodnaturalcirculationofwater.

A. fire-tubes B. furnaces C. waterdrums D. waterwalltubes

Spontaneousignitioncanresultfrom（）.

Toppingwiresfixtheheightofthederricksand（）tothedeckmaybeusedtopreventforeandaftmovement.

TemporaryCertificatesofInspectionforoffshoredrillingunitsareeffectiveuntilthe（）.

TheAmericanPetroleumInstituterecommendsmagneticparticleinspectionfor（）.

A. fire-tubes
B. furnaces
C. waterdrums
D. waterwalltubes