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【多选题】
导致配气相位变化的原因是A.
正时齿(链)轮的连接磨损
B.
发动机机油压力异常
C.
凸轮轴变形、磨损
D.
正时链磨损或正时带老化
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【单选题】In "He will come to learn driving from you ", the infinitive indicates
A.
cause
B.
purpose
C.
result
D.
direction
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