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【多选题】
关于汽缸垫，以下说法正确的是（ ）A.
汽缸垫应具备足够的强度。
B.
汽缸垫应该耐热，耐腐蚀，不容易烧蚀或者变质，有较长的使用寿命。
C.
汽缸垫应具有一定的弹性，能够弥补接合面间的不平，以保证汽缸密封性。
D.
气缸垫没有烧蚀，发动机大修时无需更换汽缸垫。
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