doubles and triples test
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Doubles and Triples CDL Test

Question #1 of 15

Should the shut-off valves on the rear of the last trailer be open or closed on a set of double trailers?


They should be open.

All shut off valves should be open.

All shut off valves should be closed.

The rear trailers shut-off valves open and the front closed.

They should be closed.








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