Refrigerant enters the condenser as a （）.

An excessive amount of water is prevented from entering...

单项选择题An excessive amount of water is prevented from entering a vessel using a water lubricated stern tube bearing by the use of the （）.

Under normal conditions, the refrigerant enters the com...

单项选择题Under normal conditions, the refrigerant enters the compressor in an operating refrigeration system as a （）.

Some vessels are equipped with a water lubricated stern...

单项选择题Some vessels are equipped with a water lubricated stern robeWhen at sea, operating under normal conditions, the water service valve from the ships saltwater system to the bearing should be （）.