单选题On top of scavenging air box is mounted a strong cast iron frame for each cylinder known as（）Acooling jacketBcylinder linerCpiston crownDcylinder cover
单选题
On top of scavenging air box is mounted a strong cast iron frame for each cylinder known as（）
A
cooling jacket
B
cylinder liner
C
piston crown
D
cylinder cover
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