单项选择题
A.Mine Safety Appliance Association B.American Chemical Society C.Marine Chemists Association D.National Fire Protection Association
A major health hazard of the product tert-butylamine is...
单项选择题A major health hazard of the product tert-butylamine is that it （）.
A.can be absorbed through the skin B.causes irreversible damage to eye tissue C.is a very unstable product D.All of the above
A low pressure annular preventer which is used to direc...
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
A low HDOP (Horizontal Dilution of Precision) number su...
单项选择题A low HDOP (Horizontal Dilution of Precision) number such as 2 indicates a （）.
A.poor fix B.good fix C.poor signal quality D.good signal quality
