市场容量的调查包括有效需求、潜在需求和()。
A.未来需求
B.服务需求
C.需求的增长速度
D.需求比例
参考答案:C
Your cousin is said ________ a new computer program recently, but do you know when he will finish it?
A.to design
B.to be designing
C.to have been designing
D.to have designed
建筑物采用未进行防火处理的钢屋架,其建筑物的耐火等级可划为一级。()