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Inordertowithstandfluidheadpressureonaship,stiffenersareoftenattachedtothebulkhead().

A. penetrations
B. plating
C. framing
D. brackets

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电容三点式与电感三点式振荡器相比,其主要优点是()。

A. 电路简单且易起振
B. 输出波形好
C. 调C或C改变频率不影响反馈系数
D. 工作频率比较低

Youshouldfrequentlycomparedrum-mountedandremote-readingwaterlevelindicators()betweenthesehavecontributedtofailuresbecauseofoverheatingthroughshortageofwater,whenaboilerwasbeingoil-fired.

A. descriptions
B. discrepancies
C. different
D. deflections

()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

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