家族性缺陷
参考答案：
经确认由设计、和/或材质、和/或工艺共性因素导致的设备缺陷称为家族性缺陷。
— What was wrong with John yesterday?
— He was too shy to talk to ______ at the party. [ ]
A. anyone
B. someone
C. no one
D. everyone
29. It is known to us that doing eye exercises ________ our eyes, and that is to say, our eyes can ________ doing eye exercises.
A．benefits; benefit from
B．benefits to; benefit
C．benefits from; benefit
D．benefits; be benfited from
