平行四边形是特殊的长方形______．（判断对错）
平行四边形不一定有直角，没有直角，就不是长方形，因此，题干说法错误；
故答案为：错误
胚胎性横纹肌肉瘤相对最为好发的部位包括（）。
A.头颈部
B.呼吸道
C.消化道
D.四肢
E.泌尿生殖道
Quality control involves monitoring specific project results to determine if they comply with relevant quality standards. To evaluate quality control outputs, the project team should definitely have a working knowledge of ______ .
A．prevention and inspection
B．sampling and probability
C．special causes and random causes
D．tolerances and control limits
