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A.butterfly valve
B.spectacle valve
C.check valve
D.globe valve
The purpose of inert gas systems aboard tank vessels is to ______.
A.allow sufficient oxygen in the tank to sustain life
B.prevent outside air from entering the tank
C.provide increase in cargo discharge pressure
D.comply with double hull pollution prevention regulations
A.one meter from the tank bottom and one meter below the tank top
B.one half the ullage of the tank and one meter below the tank top
C.one half the ullage of the tank and one meter above the tank bottom
D.at three meter intervals from the tank top to the bottom
The price of oil ______ from $15 to $18 per tank during the winter season.
A．ranged
B．differed
C．altered
D．repair
A good plan when fighting against an enemy tank is to______.
A．shoot its back
B．get near to it from behind
C．move it to the side
D．move out of its way
A.pump from the damaged tank
B.fight a fire
C.abandon ship
D.use the crossover system
By doing the "tank test", the engineers can find out______.
A．the amount of air in the plane
B．the strength of the plane structure
C．the pressure inside and outside the plane
D．the power of the airplane engines
A good plan when fighting against an enemy tank is to ______.
A．shoot its back
B．get behind it
C．move it to the side
D．move out of its way
A.dilution
B.displacement
C.precipitation
D.Either A or B
