题目：
涡轮喷气发动机的涡轮叶片常出现的故障是（）.
A.压痕
B.变形
C.裂纹
D.划伤
答案：
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参考答案：串联通风
涡轮喷气发动机的涡轮叶片常出现的故障是（）.A.压痕 B.变形 C.裂纹 D.划伤
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