Youshouldfrequentlycomparedrum-mountedandremote-readingwaterlevelindicators（）betweenthesehavecontributedtofailuresbecauseofoverheatingthroughshortageofwater,whenaboilerwasbeingoil-fired.
A. descriptions
B. discrepancies
C. different
D. deflections
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（）willbeusedtoblowawaythecombustionproductsfromthetubesurfaces.
A. Theblowdownvalve
B. Thescumvalve
C. Theairreleasecock
D. Thesoot-blower
下列电子邮件格式正确的是（）。
A. HTTP：//WPK007.126.COM
B. WPK007.HAIE
COM
D. WPK008@HAIE
E. COM
F. WPK007#163.COM
Theamountofheatreleasedbysteamwhenitchangestowateratthesametemperatureiscalled（）.
A. latentheatofcondensation
B. latentheatofvaporization
C. latentheatofsaturation
D. sensibleheatofcondensation
Periodicsurveystorenewtheloadlineassignmentforashipmustbemadeatintervalsnotexceeding（）.
A. 18months
B. 2years
C. 3years
D. 5years
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