The principal difference between loop scavenging and crossflow scavenging, as used in single acting diesel engines, is the （）<br>A:direction of air flow within the cylinder<br>B:sequence of port opening<br>C:method of opening exhaust ports<br>D:volume of air admitted to the cylinder

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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