产品质量由几方面的质量特性反映的结果？
参考答案：
（1）产品的性能和使用寿命
（2）可靠性
（3）安全性
（4）经济性
下列哪项不属于营养生殖的优点（ ）
A．繁殖速度快
B．保持亲本优良性状
C．提高后代的变异性和生活力
D．材料易得
—Airplane design is a job ______ you to work 10 to 12 hours a day and sometimes seven days
a week.
—______. I think airplane design needs good teamwork as well. [ ]
A. that need; So it is
B. that needs; So it is
C. which needs; So is it
D. which need; So is it
