[单选题]If a ship is to be laid up for an indefinite period, the saltwater side of the main condenser should be____.
[问答题]Operation with piston and connecting rod removed If some cylinder unit components, such as piston, connecting rod or big end bearing are damaged and can't be repaired, the following can be done to make emergency operation possible. (1) Remove the piston, connecting rod and big end bearing of that unit. (2) Cover lubricating oil bore in crank pin. (3) Fit a completely assembled cylinder head without the valve push rods . (4) Disconnect the pilot air pipe to avoid starting air to the cylinder head. (5) Set the HP fuel pump out of service by blocking pin. With one cylinder out of operation exhaust gas temperature of the remaining cylinders should not exceed normal full load temperatures. If the turbocharger(s) surges, reduce load further to avoid continuous surging. Engine operation and a piston and connecting rod removed from one or more cylinders, should be performed only in absolute emergency when no other means are available. Removal of one or two counterweight (s) may reduce vibrations due to unbalance. Please contact Stork-Wartsila Diesel in such a case. When the engine should be operated with one cylinder out of service, the balance of the engine is disturbed and severe or even dangerous vibrations may occur. The vibration conditions are in practice depending on the type of the installation.
[单选题]Today, the primary source of propel?ler power is the diesel engine, and the power requirement and rate of revolution very much depend on ______.