헬륨-기구용가스,산소와섞어서잠수용통기가스,극저온을얻기위한냉각/베릴륨-X선관의창,베릴륨청동·베릴륨니켈등의합금/마그네슘-카메라플래시램프·게터·단열재^^
[무물보AI] 답변 로딩중...