题目内容

HatchNo.1mustbecleaneduptomeetthe（）ofthecargosurveyors．

A. necessity
B. responsibility
C. requirement
D. stipulation

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Thesafetyvalvesshouldbetestedandadjustedwhentheboilersurveyis（）

A. completed
B. carriedout
C. cleaned
D. steamed

Inordertowithstandfluidheadpressureonaship，stiffenersareoftenattachedtothebulkhead（）.

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

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