矿井必须备有井上、下配电系统图中应当注明：线路电缆的用途、（）、电压、截面和长度。
A.型号
B.生产厂家
C.出厂日期
参考答案：A
尿毒症患者如有少尿，24小时尿量应少于多少（）
A.1500ml
B.1000ml
C.500ml
D.400ml
E.100ml
How should signal flares be used after you have abandoned ship and are adrift in a liferaft?（）.
A.Immediately use all the signals at once
B.Use all the signals during the first night
C.Employ a signal every hour after abandoning ship until they are gone
D.Use them only when you are aware of a ship or plane in the area
