單項選擇題Which of the materials listed is used as the dynamic seal material on mechanical seals installed on most centrifugal pumps used in water service?()

A.Copper
B.Copper and carbon
C.Carbon
D.Bronze


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1.單項選擇題For the proper control of the air temperature in an air conditioning system using chilled water circulation, which of the listed conditions should remain constant regardless of load changes?()

A.Chilled water system supply temperature
B.Chilled water system return temperature
C.Compressor discharge temperature
D.Compressor suction pressure

3.單項選擇題The operating water is supplied under the ()of an oil separator.

A.sliding bowl bottom
B.bowl hood
C.bowl
D.filter units

4.單項選擇題The ()has a water damp ring.

A.purifier
B.oil/water separator
C.incinerator
D.distiller

5.單項選擇題Duty officer informs us that the vessel is out of harbor and in “Full Ahead”We are going to run ().

A.diesel oil instead of fuel oil
B.fuel oil instead of diesel oil
C.diesel oil instead fuel oil
D.fuel oil instead diesel oil