[单选] A list signal of one white light indicates that the vessel is （）.
A . on an even keel B . listing about 1° to the side the light is displayed on C . listing over 5° With the light displayed on the high side D . listing，and the chutes should be directed to the side where the light is displayed
4*3复用和3*3复用相比，（）的频率复用率高，（）的干扰较小。
A low HDOP (Horizontal Dilution of Precision) number such as 2 indicates a （）. poor fix。 good fix。 poor signal quality。 good signal quality。
救生艇配备的海锚索和回收索的长度应不少于10米。
自供气体系统的救生艇，艇内气压值不得低于艇外大气压，也不得超过大气压20hpa以上。
The piston cooling system may employ similar components, except that （） is used instead of a head tank. a sump tank。 a feed well。 a double bottom tank。 a drain tank。
A list signal of one white light indicates that the vessel is （）.
