题目内容

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

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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

Theamountofheatreleasedbysteamwhenitchangestowateratthesametemperatureiscalled().

A. latentheatofcondensation
B. latentheatofvaporization
C. latentheatofsaturation
D. sensibleheatofcondensation

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