The （） pump discharges a nearly constant amount of liquid regardless of pressure.
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
On the approach of a warm front the barometric pressure usually（）.
The sudden reduction of pressure occurring within the crankcase of a refrigeration compressor during starting causes the （）.
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
（）means check the swing of the vessel’s head in a turn.
One cause of high head pressure occurring in a refrigeration system can be （）.
The atmosphere in the vicinity of a high pressure area is called a(n)（）.
Which of the listed pressure control valves would be used to establish the maximum operating pressure of a hydraulic system?（）
In order to withstand fluid head pressure on a ship，stiffeners are often attached to the bulkhead（）.
Which of the listed components is considered to separate the high pressure side of a refrigeration cycle from the low pressure side of the cycle?（）
The compass heading of a vessel differs from the true heading by（）.
A barometer showing falling pressure indicates the approach of a（）.
Which of the following terms is used to identify the pressure of the liquid entering a pump?（）
The vapor pressure of a substance（）.
The vapor pressure of a gas is the pressure necessary to keep it in a(n)（）.
The volute of centrifugal pump also acts as a diffuser converting （）into pressure head.
The （） discharge a nearly constant amount of liquid regardless of pressure.
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.
The pressure head of a water pump is given in the unit of （）.
The heading of a vessel is indicated by what part of the compass? （）
（） provides the head or pressure to supply the domestic water where required.
Janet Summers, the head teacher at Friars, said that while the school was in turmoil after two heads had left because of w______ pressure it needed support rather than condemnation.
The（)is Ireland’ s head of state.A、president
