A.sparking being taking place
B.to spark taking place
C.sparking to be taken place
D.sparking taking place
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A.is due to
B.dues to
C.is because
D.is for
A.send
B.sends
C.was sent
D.were sent
A.any problem
B.some problem
C.any problems
D.some problems
A.did not interrupt
B.were not interrupted
C.had not interrupted
D.had not been interrupted
A.hand it over
B.take it over
C.carry it over
D.carry it out
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Engine parameters shall be corresponded to NOx Technical Files. This is required by （）
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（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.