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举一反三
【单选题】How many grams of gold are there in 2.65 moles of Au?
A.
5.22 ×10 2 g
B.
5.22 ×10 3 g
C.
5.22 ×10 4 g
D.
5.22 ×10 5 g
【简答题】The acting direction of static pressure is always in the direction of the acting suce
【简答题】The definition about static pressure is
【单选题】The static pressure and density of the airstream behind the expansion wave are ________.
A.
increased
B.
decreased
【单选题】The static pressure and density of the airstream behind the shock wave are greatly ________.
A.
increased
B.
decreased
【单选题】Oil pressure in the lubrication system is_______ than the static sea water head to ensure that sea water cannot enter the sterntube in the event of seal failure.
A.
higher
B.
lower
C.
very higher
D.
very lower
【单选题】Oil pressure in the lubrication system is _____ the static sea water head to ensure that sea water _____ the stem-tube.
A.
lower than / can lubricate
B.
lower than / can cool
C.
higher than / can enter
D.
higher than / cannot enter
【单选题】How many senators do they need to vote guilty in order to remove a President from office?
A.
One third
B.
Two thirds
C.
A half
D.
Three quarters
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