单选题The principal difference between loop scavenging and crossflow scavenging, as used in single acting diesel engines, is the （）Adirection of air flow within the cylinderBsequence of port openingCmethod of opening exhaust portsDvolume of air admitted to the cylinder
单选题
The principal difference between loop scavenging and crossflow scavenging, as used in single acting diesel engines, is the （）
A
direction of air flow within the cylinder
B
sequence of port opening
C
method of opening exhaust ports
D
volume of air admitted to the cylinder
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