机械设计带轮辅助计算 ElseIf aa1 > 170 Then kaa = 0.98 ElseIf aa1 > 165 Then kaa = 0.96 ElseIf aa1 > 160 Then kaa = 0.95 ElseIf aa1 > 155 Then kaa = 0.93 ElseIf aa1 > 150 T