78. The piston crown is burnt out.
A、
A、Thepistonheadisbrokenup.;
B、
B、Thepistoncrowniswornout.;
C、
C、Thepistonheadneedstoberepaired.;
D、
D、Thepistoncrownisputout.
发布时间：2025-07-07 18:04:29
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答案：A. The piston head is broken up.
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