When did health insurance began in the United States?

Which type of valve has a baffle that lowers into the path of the water by turning a screw-type handle?

A. Ball valve B. Gate valve C. Clapper valve D. Butterfly valve

You are working the scene of a collision involving a tractor trailer that is hauling an unknown chemical. After it has been determined that no material has been spilled, the rescue chief asks you to get the truck's shipping papers. Where would these MOST likely be located?

A) Rear compartment on the tanker B) Electrical box between the tractor and trailer C) Cab of the truck D) Shipping vault on the trailer