An internal mouthpiece is said to be running free if the length of the mouthpiece is __________
the diameter of the orifice.
(A) Less than twice
(B) More than twice
(C) Less than three times
(D) More than three times
the diameter of the orifice.
(A) Less than twice
(B) More than twice
(C) Less than three times
(D) More than three times