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单选题
Cylinder linings constructed as an integral part of the block, are characterized by which of the following disadvantages?（）
A
They conduct heat poorly
B
They are expensive
C
They cannot be replaced
D
They require special tools for removal
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单选题Cylinder linings constructed as an integral part of the block, are characterized by which of the following disadvantages?（）A
They conduct heat poorlyB
They are expensiveC
They cannot be replacedD
They require special tools for removal
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from which
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