答案:C
Since drinking water is a limited resource, we ________ let children know how precious it is, and teach
them to conserve it.[ ]
A.might
B.would
C.should
D.could
某二元混合物,进料量为l00kmol/h,xF=0.6,要求塔顶xD不小于0.9,则塔顶最大产量为()。
A、60kmol/h
B、66.7kmol/h
C、90kmol/h
D、100kmol/h