单项选择题 In the constant-tension mooring, the mooring lines holding the ship to the pier will maintain a constant tension even with changes in tide or ship’s draft, （）.

单项选择题 （）is put into use in the late years to maintain a preset tension in a mooring line after a ship has been tied up at a pier.

单项选择题 However fast or slow the combustion rate, it is still a （） between carbon, hydrogen, sulphur and oxygen that releases heat.