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【单选题】
Why does Pecola’s mother choose the white girl over Pecola?A.
Because she is afraid that the white girl’s parents will be angry at her
B.
Because she is afraid of unemployment
C.
Because she enjoys being the servant of white people
D.
Because she accepts the concept that the black people are inferior
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【简答题】现有数值如下:-151,-150,10,74,-89,-315,-98,71,-43,90,-131,133,-122,-80,52,20,-31,-72,22,28,104,60,-45,11,-18,-220,73,-13,36,238,108,-28,54,3,-52,140,11,-10,-125,0,-219,-16,12,-120,18,93,34,133,55,27,-87,17,-...
【单选题】一台燃煤采暖锅炉，实测烟尘排放浓度为l50mg/m 3 过剩空气系数为2．1，折算为过剩空气系数1．8的烟尘排放浓度为（）。
A.
128mg/m 3
B.
175mg/m 3
C.
270mg/m 3
D.
315mg/m 3
【简答题】用计算器计算。 456+128= 395+105= 836-278= 1000-999= 26×37= 15×24= 315÷5= 204÷4=
【单选题】一台燃煤采暖锅炉，实测烟尘排放浓度为l50mg/m³过剩空气系数为2.1，折算为过剩空气系数1.8的烟尘排放浓度为（）。
A.
128mg/m³
B.
175mg/m³
C.
270mg/m³
D.
315mg/m³
【简答题】现有数值如下:-26,-56,-22,28,123,-121,-114,45,-202,-197,24,44,-22,49,56,-113,22,152,-119,65,315,-39,57,128,-19,1,59,-140,-145,,10,-141,-32,15,68,139,-95,-39,45,206,-37,114,288,-49,-71,200,-50,42,-66,6,-3...
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