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【单选题】
高速重载齿轮传动中，当散热条件不良时，齿轮的主要失效形式是（）。A.
轮齿疲劳折断
B.
齿面点蚀
C.
齿面磨损
D.
齿面胶合
E.
齿面塑性变形
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反馈参考答案：
举一反三
【单选题】听力原文： You may be all these things at the office, and more. But when it comes to getting ahead, experts say, the ABCs of business should include a P, for polities, as in office polities. Hard work alon...
A.
The political views and beliefs of office workers.
B.
The interpersonal relationships within a company.
C.
The various qualities required for a successful career.
D.
The code of behavior. for company staff.
【判断题】Folk tales say the game originates from the activities of seeking Qu Yuan's body, but experts, after painstaking and meticulous research, conclude that dragon boat racing is a semi-religious, semi-ent...
A.
正确
B.
错误
【单选题】The Power of Pretend You peak into your seven-year-old's room to see how he and his best friend are going with their playtime. They are deep in a make-believe game in which the superhero fights a mons...
A.
Y
B.
N
C.
NG
【简答题】And experts say a______ can actually be a serious problem.
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