Major constituents in a fiber-reinforced composite material are _____
A.
reinforcing fibers
B.
matrix
C.
coupling agents
D.
fillers
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【简答题】阅读理解。 One evening Tim is driving his car in the country and looking for a hotel. Then he sees an old man on the side of the road, so he stops his car and says to the old man, 'Where is the Sun Hotel? ...