The size of the discharge ring used for the efficient operation of a disk type purifier is dependent upon the ___.

The _____ discharge a nearly constant amount of liquid regardless of pressure.

The pollution prevention regulations do not apply to the transfer or discharge of ____.

Visual inspection of chrome－plated piston compression rings reveals a black ring face at the position of the cylinder liner portsThis condition indicates a ring which .

According to Annex I of MARPOL 73／78, the instantaneous discharging rate of the oily waste

The time of discharging oil is short, but oily water separator discharges oil frequentlyTh

Whats the real meaning of the phrase "in the ring" （Line 6, Para. 3)？A．Getting the ring as