单选题:Edith Flanigen is the only co-inventor of LEDs. 题目分类:理工类 题目类型:单选题 查看权限:VIP 题目内容: Edith Flanigen is the only co-inventor of LEDs. A.Right B.Wrong C.Not mentioned 参考答案: 答案解析:
This is the first research finding about the planets with a This is the first research finding about the planets with a chance for life.A.R 分类:理工类 题型:单选题 查看答案
关于安全技术防范系统检测的规定,正确的有( )。 关于安全技术防范系统检测的规定,正确的有( )。 A.摄像机抽检数量不应低于20% B.出入口识读设备抽检数量不应低于30% C.探测器的抽检数量不应少于3 分类:理工类 题型:单选题 查看答案