____ are supplied by main switchboard directly.
A.Suez Canal searchlight, air compressor and air conditioning compressor
B.Air compressor, boiler blower and refrigeration plant
C.Boiler blower, Suez Canal searchlight and refrigeration plant
D.Suez canal searchlight, air compressor and boiler blower
第1题
A.are interdependent
B.are not interdependent
C.have nothing to do with each other
D.are independent
第2题
A.Dull black appearance
B.Bright appearance
C.Thin layer of lacquer
D.Thick oily film
第3题
A.temperature
B.pumping rate
C.pressure
D.heat
第4题
A.must be centrifuged
B.must by filtered
C.must be changed
D.is holding finely dispersed carbon in suspension
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