单选题The common rail engines show great advantages in combustion especially（）.Aat high speed and full loadBat low speed and part loadCwhen heavy fuel oil is used at seaDwhen the ships run long distance
单选题
The common rail engines show great advantages in combustion especially（）.
A
at high speed and full load
B
at low speed and part load
C
when heavy fuel oil is used at sea
D
when the ships run long distance
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