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【单选题】
石油石油蒸馏后的残渣、渣油或石油沥青经过高温焦化后的产品，通常采用（）生产。A.
延迟焦化方法
B.
釜式焦化方法
C.
平炉焦化
D.
接触焦
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【单选题】Why would the bull not notice it if the gnat left? ( )
A.
Because the gnat was too light and small for the bull to notice it.
B.
Because the bull is a pretty dull animal.
C.
Because the bull deliberately ignored the gnat.
【单选题】Why would the bull not notice it if the gnat left?
A.
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B.
The bull is pretty dull animal.
C.
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【单选题】Why may the bull sharks attack people frequently?
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Because human being is their favorite food.
B.
Because they may wildly attack anything in the area.
C.
Because they swims in shallow waters where people swim.
D.
Because they are very aggressive sharks.
【简答题】当温度升高时,三极管的参数 β 会 , 会 ,导通电压会 。
【简答题】当温度升高时,三极管的参数β会( )。
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