钢筋机械连接的连接区域长度应按()计算。
A.5d
B.250
C.35d
D.500
参考答案:C
Tell me when you ______ at the airport, Alice. I’ll go there to meet you if I’m free.
A.arrive
B.would arrive
C.have arrived
D.are arriving
盈利模式最终是由()导向确定的。
A.成本
B.需求
C.价值分析
D.竞争