A:half not as wide a
B:wide not as half a
C:not half as wide a
D:as wide as not half
如图是关节示意图,请据图回答问题:
新型材料的出现是材料发展史的重大突破.下列应用的材料属于复合材料的是( )
观察下列一组漫画,根据所学知识,回答下列问题。