某件商品进价100元,售价150元,则其利润是( )元,成本利润率是( ).
50;50%
某烃分子结构中含一个苯环、两个碳碳双键和一个碳碳三键,它的分子式可能为( )
A.C9H12
B.C17H20
C.C20H30
D.C12H20
The plan has to be ________ to meet the real situation. [ ]
A. adjusted
B. adapted
C. operated
D. reflected