喷雾干燥造粒的粉料容重较小，压制成型时，坯体不易被压实。
参考答案：错
骨质疏松症特征有哪些()
A．低骨量
B．易骨折
C．骨脆性增加
D．骨质增生特别明显
E．骨组织微细结构破坏
Don't ____ a person only because he has failed in an examination. [ ]
A. look up
B. look down
C. look down on
D. look up to
