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[单选题]() pistons have low inertia and high coefficient of thermal expansion.
A. Cast iron
B. Cast steel
C. Forged steel
D. Aluminum
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[单选题]水润滑式艉轴的()包覆铜套,以防止腐蚀。
A. 工作轴颈
B. 非工作轴颈
C. 2/3轴颈长度上
D. 轴颈全长
[单选题]When the fuel oil is burning in the combustion chamber, it ().
A. gives up large amount of heat
B. gives off large amount of heat
C. gives up large amount of steam
D. gives off large amount of steam
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