The contrast medium for a cholecystogram is usually in ____ form

Which of the following can happen when a discharge valve is turned off to quickly?

A. Cavitation B. Backflow C. Pressure drop D. Water hammer

Scale models are useful to the investigator, but what is a major drawback of this test?

A) Radiant heat or ventilation factors B) Finding fuel C) Ignition at the same scale D) No real value from scale burns