The engine has more than 300（ ）,made of a number of different materials.A.compositionsB.ingredientsC.compoundsD.components
The engine has more than 300（ ）,made of a number of different materials.
A.compositions
B.ingredients
C.compounds
D.components
B.ingredients
C.compounds
D.components
参考解析
解析：component尤指用于机械装置的（组）成（部）分。A.composition尤用于指物体内在固有的不可分割的（组）成（部）分；B.ingredient主要指混合物之成分，如：蛋糕的一种“成分”（ingredient）是糖，糖的“成分”（compositions）有氢等；C.compound“混合物”。
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