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【单选题】
Why didn't the state and local air pollution laws achieve the end of reducing pollution?A.
Industries tend to disregard the laws because they don't want to spend extra money on the processing of industrial wastes.
B.
Although measures are taken to send industrial pollutants higher up the atmosphere, the amount of industrial pollutants remains the same.
C.
The smokestacks built to release pollutants are not tall enough.
D.
Only a small number of industries are equipped to live up to the new standards of the air pollution laws.
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【简答题】溶剂按极性可分为( )、( )、( ) 三类。
【简答题】Amplifier are devices that produce 1 input signals. The 2 is the amplification ratio of the output signal to its input signals. Operational amplifiers are often called 3 , they usually have 4 inputs. ...
【单选题】If the densit y , ρ , of air (in an op en system at atmospheric pressure) increases b y a factor of 1.4x due to a temp erature c hange,
A.
sp ecific w eigh t increases b y 1.4x
B.
sp ecific w eigh t increases b y 13.7x
C.
sp ecific w eigh t remains the same
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