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【简答题】
某项目环评中使用 SCREEN3模式计算自不同排放源排放的污染物A和污染物B的落地浓度见下表。 下风向距离( m ) 污染物扩散计算结果, mg/m 3 污染物 A 污染物 B 500 0.1 0.06 1000 0.15 0.09 1500 0.23 0.11 2000 0.31 0.14 2500 0.36 0.16 3000 0.34 0.19 3500 0.26 0.21 4000 0.29 0.20 4500 0.13 0.18 5000 0.10 0.15 5500 0.08 0.14 污染物 A的环境标准值为1.0mg/m 3 ,污染物 B的环境标准值为0.25mg/m 3 。请确定本项大气评价等级。
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【简答题】根据分析对象不同,分析化学可以分为( )分析与( )分析;根据分析原理和操作方法的不同,可分为( )分析和( )分析。
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【单选题】What would have happened ______as far as the river bank ?
A.
Bob had walked farther
B.
if Bob should walk farther
C.
had Bob walked farther
D.
if Bob walked farther
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【单选题】_____I was there that evening.
A.
It happened to
B.
It happened that
C.
That happened
D.
It is happened that
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