He risked _____ his job to see me off.

A．losing

B．to lose

C．being lost

D．lost

范第姆特图反映的是( )之间的关系。

A．理论塔板数与载气流速

B．理论塔板高度与载气流速

C．理论塔板数与柱温

D．理论塔板高度与柱温