A.take；save
B.to take；save
C.take；to save
D.to take；to save
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A.is used to be
B.was used to be
C.used to be
D.was used to
A.has left
B.had left
C.has been away
D.had been away
A.in
B.to
C.from
D.by
A.stand by
B.stand for
C.stood by
D.stood for
A.to pay attention
B.paying attention
C.pay attention
D.your paying attention
最新試題
The treatment of the fuel oils involves storage, heating, filtering and（）
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As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?（）
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When does auxiliary burner of incinerator put into operation? （）Ⅰ. start incinerator when it is coldⅡ. the sludge for dealing with is littleⅢ. the sludge for dealing with is largeⅣ. the water and impurity in sludge are too muchⅤ. the temperature in incinerator is lowⅥ. dealing with little solid rubbish
A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）
Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）
（） is not installed on the main switchboar.
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