题目
A.惊吓
B.无聊
C.摩擦
第6题
A.depression
B.barricade
C.resistance
D.friction
第7题
A.Higher hardness
B.Hot hardness
C.Wear resistance
D.Toughness and Low friction
第8题
A.have insight into
B.come up with
C.allow for
D.reflect on
第9题
A.control friction and wear
B.improve corrosion resistance
C.change physical property
D.alter dimension and vary appearance
第10题
A.power output
B.friction and wear
C.indicated pressure(指示压力)
D.rated horsepower
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