单项选择题
A.135mmB.150mmC.165mmD.170.mm
A.80℃B.90℃C.95℃D.100℃
A.1~1.5mmB.1~2mmC.2~2.5mmD.2~3mm
A.过热B.噪声大C.燃油燃烧不充分D.振动
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