单项选择题
A low pressure annular preventer which is used to direct flow of kick fluids away from the rig floor is called a （）.
A.dump valve B.deflector C.separator D.diverter
单项选择题 A low HDOP (Horizontal Dilution of Precision) number such as 2 indicates a （）.
单项选择题 A list signal of one white light indicates that the vessel is （）.
单项选择题 A list man would expect to see any of the following light signals except （）.
