光的干涉和衍射现象反映了光的()。
A.偏振性质
B.波动性质
C.横波性质
D.纵波性质
参考答案:B
A growing number of psychotherapists are ______ ideas that have dominated their field for more than a century.
A.shaking B.shaming C.shedding D.shining
成本利润率的计算公式为( )
A.成本利润率=成本/销售收入×100%
B.成本利润率=利润/成本×100%
C.成本利润率=成本/利润×100%
D.成本利润率=销售收入/成本×100%