单选题The scavenging air ports are located at （） that they are just exposed by the upper edge of the piston when the piston is in the bottom dead center position.Aso a heightBsuch a heightCso highDsuch high
单选题
The scavenging air ports are located at （） that they are just exposed by the upper edge of the piston when the piston is in the bottom dead center position.
A
so a height
B
such a height
C
so high
D
such high
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