频率规划中4x3复用模式是指每个站（）个小区，每（）个站进行复用。
气胀救生筏的登筏平台与筏体（）部分相连接。
A low pressure annular preventer which is used to direct flow of kick fluids away from the rig floor is called a （）. dump valve。 deflector。 separator。 diverter。
耐火救生艇在实验演习喷洒水操作后应该将洒水管系封闭好。
A list signal of one white light indicates that the vessel is （）. on an even keel。 listing about 1° to the side the light is displayed on。 listing over 5° With the light displayed on the high side。 listing，and the chutes should be directed to the side where the light is displayed。
A low HDOP (Horizontal Dilution of Precision) number such as 2 indicates a （）.
