A.to increase
B.to be so increased
C.increased
D.being so increased
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A.it difficult for them to finish the job in time
B.difficult for them to finish the job in time
C.they have much difficulty to finish the job in time
D.that difficult for them to finish the job in time
A.bunker fuel for use aboard ship
B.lubricating oil for use aboard ship
C.coconut oil carried in tank vessels
D.oily water from a ships bilges
A.stop bleeding
B.open airway
C.mouth-to-mouth respiration
D.call for help
A.station bill
B.clearance papers
C.certificate of inspection
D.permit to proceed
A.14 percent
B.15 percent
C.16 percent
D.17 percent
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（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
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