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【单选题】
When the enzyme concentration is proportional to the reaction rateA.
The active center of the enzyme is saturated by the substrate
B.
the reaction rate is the Vmax
C.
Enzyme concentration is much greater than substrate concentration
D.
Substrate concentration is much larger than enzyme concentration
E.
The reaction has just begun
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【单选题】During fueling operations, which of the listed precautions should be taken when topping off fuel tanks?
A.
Reduce the pumping rate by closing the deck filling valve
B.
Close all overflow valves
C.
Place 5 gallon containers under all flange connections in the fuel line
D.
Reduce the pumping rate and sound tanks frequently as the level rises
【单选题】Upon completion of fueling a gasoline driven vessel it is necessary to ______.
A.
keep ports，doors，windows，and hatches closed
B.
start engines immediately
C.
ventilate before starting engine
D.
None of the above
【简答题】Fueling station
【单选题】Which statement is FALSE concerning precautions during fueling operations?（）
A.
All engines，motors，fans，etc. should be shut down when fueling
B.
All windows，doors，hatches，etc. should be closed
C.
A fire extinguisher should be kept nearby
D.
Fuel tanks should be topped off with no room for expansion
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