接触曲线
参考答案：同一种矿物，同一种药剂，气泡能否与矿物附着的药剂用量与pH值之间的关系曲线，称为接触曲线。
Tom took a taxi to the airport, only _____ his plane high up in the sky.
A．finding
B．to find
C．being found
D．to have found
能大幅度地减少劳动力是自动化仓库最突出的优点。
