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【单选题】
气缸盖工作条件恶劣的主要原因是________。1气体力使它产生弯曲变形2高温燃气使它产生热应力3触火面燃气的腐蚀4面的穴蚀5结构复杂而产生的应力集中6气缸盖安装予紧力A.
①②③④⑤
B.
②③④⑤⑥
C.
①③④⑤⑥
D.
①②③⑤⑥
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